chore(frontend): Phase 1 技术债务清理 - 删除死代码和重复样式

- 删除 src/config/navigation.tsx（废弃文件，211行）
- 删除 src/components/business/business.css（死CSS，365行）
- 删除 src/api/dashboard.ts（废弃API模块，42行）
- 移除 router/index.tsx 重复 my-voices 路由（7行）
- 清理 generate.css 重复按钮样式（48行，改用 ui.css 统一样式）
- 清理 Admin.css 重复 .xx-card/.xx-select 定义（40行）

共减少约 713 行代码，vite build 验证通过

apps/web/src/api/dashboard.ts

@@ -1,42 +0,0 @@
-/**
- * 仪表盘 API
- * Phase 1 新增：用户仪表盘概览
- */
-import apiClient from "./client";
-
-/** 仪表盘概览数据 */
-export interface DashboardOverview {
-  /** 素材总数 */
-  total_assets: number;
-  /** 已用存储（字节） */
-  used_storage_bytes: number;
-  /** 总标题数 */
-  total_titles: number;
-  /** 总配音数 */
-  total_voices: number;
-  /** 生成任务总数 */
-  total_tasks: number;
-  /** 成品总数 */
-  total_products: number;
-  /** 最近生成任务 */
-  recent_tasks: Array<{
-    id: string;
-    task_type: string;
-    status: string;
-    progress: number;
-    user_message: string;
-    created_at: string;
-  }>;
-  /** 订阅信息 */
-  subscription: {
-    plan: "free" | "pro" | "enterprise";
-    status: "active" | "inactive" | "expired";
-    expires_at?: string;
-  };
-}
-
-/** 获取仪表盘概览数据 */
-export const getDashboardOverview = async (): Promise<DashboardOverview> => {
-  const response = await apiClient.get("/dashboard/overview");
-  return response.data;
-};

apps/web/src/components/business/business.css

@@ -1,365 +0,0 @@
-/* V21 业务组件统一样式 */
-
-/* ==================== 按钮 ==================== */
-.xx-primary-btn {
-  background: var(--gradient-primary) !important;
-  color: var(--text-inverse) !important;
-  border: none !important;
-  border-radius: var(--radius-md) !important;
-  padding: 10px 20px !important;
-  font-weight: var(--font-weight-bold) !important;
-  box-shadow: var(--shadow-primary) !important;
-  transition: var(--transition-all) !important;
-  cursor: pointer;
-  height: auto !important;
-}
-
-.xx-primary-btn:hover {
-  box-shadow: var(--shadow-hover) !important;
-  transform: translateY(-1px);
-}
-
-.xx-ghost-btn {
-  background: transparent !important;
-  color: var(--primary-color) !important;
-  border: 2px solid var(--primary-color) !important;
-  border-radius: var(--radius-md) !important;
-  padding: var(--space-sm) 18px !important;
-  font-weight: var(--font-weight-bold) !important;
-  transition: var(--transition-all) !important;
-  cursor: pointer;
-  height: auto !important;
-}
-
-.xx-ghost-btn:hover {
-  background: var(--primary-soft) !important;
-}
-
-/* ==================== 卡片 ==================== */
-.xx-card {
-  background: var(--bg-elevated);
-  border: 1px solid var(--border-color);
-  border-radius: var(--radius-xl);
-  box-shadow: var(--shadow-card);
-  padding: var(--space-lg);
-  margin-bottom: 20px;
-  transition: all var(--transition-slow);
-}
-
-.xx-card:hover {
-  box-shadow: var(--shadow-md);
-  transform: translateY(-2px);
-}
-
-/* ==================== 页面结构 ==================== */
-.xx-page {
-  max-width: 1200px;
-  margin: 0 auto;
-  padding: var(--space-lg);
-}
-
-.xx-page-head {
-  display: flex;
-  justify-content: space-between;
-  align-items: flex-start;
-  gap: 18px;
-  margin-bottom: 28px;
-}
-
-.xx-page-head h2 {
-  font-size: 26px;
-  font-weight: var(--font-weight-extrabold);
-  color: var(--text-primary);
-  margin: 0 0 var(--space-sm);
-}
-
-.xx-page-head p {
-  font-size: var(--font-size-base);
-  color: var(--text-secondary);
-  margin: 0;
-}
-
-/* ==================== 表格样式 ==================== */
-.xx-table-card {
-  background: var(--bg-elevated);
-  border: 1px solid var(--border-color);
-  border-radius: var(--radius-xl);
-  box-shadow: var(--shadow-card);
-  padding: 20px;
-  overflow: hidden;
-}
-
-/* 表格包装器 */
-.xx-table-wrapper {
-  border-radius: var(--radius-lg);
-  overflow: hidden;
-}
-
-/* ==================== 标签/Tag ==================== */
-.xx-tag {
-  padding: var(--space-xs) 12px;
-  border-radius: var(--radius-xs);
-  font-size: 13px;
-  font-weight: var(--font-weight-medium);
-}
-
-.xx-tag-indigo {
-  background: var(--primary-soft);
-  color: var(--primary-color);
-  border: 1px solid var(--color-primary-200);
-}
-
-.xx-tag-success {
-  background: var(--success-soft);
-  color: var(--color-secondary-500);
-  border: 1px solid var(--success-border);
-}
-
-.xx-tag-warning {
-  background: var(--warning-soft);
-  color: var(--accent-dark);
-  border: 1px solid var(--color-accent-200);
-}
-
-.xx-tag-error {
-  background: var(--error-soft);
-  color: var(--error-color);
-  border: 1px solid var(--error-border);
-}
-
-/* ==================== 搜索栏 ==================== */
-.xx-search-bar {
-  margin-bottom: 20px;
-}
-
-.xx-search-input {
-  width: 100%;
-  padding: 12px 18px;
-  border: 2px solid var(--border-color);
-  border-radius: var(--radius-md);
-  font-size: var(--font-size-base);
-  background: var(--bg-primary);
-  transition: var(--transition-all);
-  outline: none;
-}
-
-.xx-search-input:focus {
-  border-color: var(--primary-color);
-  box-shadow: 0 0 0 4px
-    color-mix(in srgb, var(--primary-color) 10%, transparent);
-}
-
-/* ==================== Modal ==================== */
-.xx-modal .ant-modal-content {
-  border-radius: var(--radius-xl);
-  padding: var(--space-lg);
-}
-
-.xx-modal .ant-modal-header {
-  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
-  padding: 20px var(--space-lg);
-  border-bottom: 1px solid var(--border-color);
-}
-
-.xx-modal .ant-modal-title {
-  font-size: var(--font-size-lg);
-  font-weight: var(--font-weight-bold);
-  color: var(--text-primary);
-}
-
-.xx-modal .ant-modal-footer {
-  border-top: 1px solid var(--border-color);
-  padding: var(--space-md) var(--space-lg);
-}
-
-/* ==================== 空状态 ==================== */
-.xx-empty-state {
-  text-align: center;
-  padding: var(--space-3xl) var(--space-lg);
-  color: var(--text-secondary);
-}
-
-.xx-empty-state-icon {
-  font-size: 48px;
-  margin-bottom: var(--space-md);
-}
-
-/* ==================== 网格布局 ==================== */
-.xx-grid-2 {
-  display: grid;
-  grid-template-columns: repeat(2, 1fr);
-  gap: 20px;
-}
-
-.xx-grid-3 {
-  display: grid;
-  grid-template-columns: repeat(3, 1fr);
-  gap: 20px;
-}
-
-.xx-grid-4 {
-  display: grid;
-  grid-template-columns: repeat(4, 1fr);
-  gap: 20px;
-}
-
-@media (max-width: 768px) {
-  .xx-grid-2,
-  .xx-grid-3,
-  .xx-grid-4 {
-    grid-template-columns: 1fr;
-  }
-}
-
-/* ==================== 配额展示 ==================== */
-.xx-quota-item {
-  padding: 20px;
-  background: var(--bg-primary);
-  border: 1px solid var(--border-color);
-  border-radius: var(--radius-lg);
-  transition: var(--transition-all);
-}
-
-.xx-quota-item:hover {
-  border-color: var(--primary-color);
-  box-shadow: 0 8px 24px
-    color-mix(in srgb, var(--primary-color) 10%, transparent);
-}
-
-/* ==================== 进度条 ==================== */
-.xx-progress {
-  margin-top: 12px;
-}
-
-/* ==================== Ant Design 覆盖样式 ==================== */
-/* Table overrides */
-.ant-table-wrapper .ant-table-thead > tr > th {
-  background: var(--bg-secondary) !important;
-  font-weight: var(--font-weight-bold) !important;
-  color: var(--text-primary) !important;
-  border-bottom: 2px solid var(--border-color) !important;
-  padding: 14px var(--space-md) !important;
-}
-
-.ant-table-wrapper .ant-table-tbody > tr > td {
-  padding: 14px var(--space-md) !important;
-  border-bottom: 1px solid var(--color-gray-100) !important;
-}
-
-.ant-table-wrapper .ant-table-tbody > tr:hover > td {
-  background: var(--color-gray-50) !important;
-}
-
-/* Card overrides */
-.ant-card {
-  border-radius: var(--radius-xl) !important;
-  border: 1px solid var(--border-color) !important;
-}
-
-.ant-card-head {
-  border-bottom: 1px solid var(--border-color) !important;
-  min-height: 52px !important;
-  padding: 0 var(--space-lg) !important;
-}
-
-.ant-card-head-title {
-  font-weight: var(--font-weight-bold) !important;
-  font-size: var(--font-size-md) !important;
-  color: var(--text-primary) !important;
-}
-
-.ant-card-body {
-  padding: 20px var(--space-lg) !important;
-}
-
-/* Modal overrides */
-.ant-modal-content {
-  border-radius: var(--radius-xl) !important;
-  overflow: hidden;
-}
-
-.ant-modal-header {
-  padding: 20px var(--space-lg) !important;
-  background: var(--bg-primary) !important;
-}
-
-.ant-modal-title {
-  font-weight: var(--font-weight-bold) !important;
-  font-size: var(--font-size-lg) !important;
-  color: var(--text-primary) !important;
-}
-
-.ant-modal-body {
-  padding: var(--space-lg) !important;
-}
-
-.ant-modal-footer {
-  padding: var(--space-md) var(--space-lg) !important;
-}
-
-/* Button overrides */
-.ant-btn-primary {
-  background: var(--gradient-primary) !important;
-  border: none !important;
-  border-radius: var(--radius-md) !important;
-  box-shadow: var(--shadow-primary) !important;
-  height: auto !important;
-  padding: 10px 20px !important;
-  font-weight: var(--font-weight-bold) !important;
-}
-
-.ant-btn-primary:hover {
-  background: var(--gradient-primary) !important;
-  box-shadow: var(--shadow-hover) !important;
-  transform: translateY(-1px);
-}
-
-/* Tag overrides */
-.ant-tag {
-  border-radius: var(--radius-xs) !important;
-  padding: var(--space-xs) 12px !important;
-  font-weight: var(--font-weight-medium) !important;
-}
-
-/* Select overrides */
-.ant-select-selector {
-  border-radius: var(--radius-md) !important;
-  border-color: var(--border-color) !important;
-}
-
-.ant-select:not(.ant-select-disabled):hover .ant-select-selector {
-  border-color: var(--primary-color) !important;
-}
-
-.ant-select-focused .ant-select-selector {
-  border-color: var(--primary-color) !important;
-  box-shadow: 0 0 0 3px
-    color-mix(in srgb, var(--primary-color) 10%, transparent) !important;
-}
-
-/* Input overrides */
-.ant-input {
-  border-radius: var(--radius-md) !important;
-  border-color: var(--border-color) !important;
-  padding: 10px 14px !important;
-}
-
-.ant-input:hover {
-  border-color: var(--primary-color) !important;
-}
-
-.ant-input:focus {
-  border-color: var(--primary-color) !important;
-  box-shadow: 0 0 0 3px
-    color-mix(in srgb, var(--primary-color) 10%, transparent) !important;
-}
-
-/* Progress overrides */
-.ant-progress-inner {
-  background: var(--color-gray-100) !important;
-  border-radius: var(--radius-xs) !important;
-}
-
-.ant-progress-bg {
-  border-radius: var(--radius-xs) !important;
-}

apps/web/src/config/navigation.tsx

@@ -1,211 +0,0 @@
-/**
- * 统一导航配置
- * Header 和 Sidebar 共用此数据源
- */
-import React from "react";
-import {
-  DashboardOutlined,
-  VideoCameraOutlined,
-  FileOutlined,
-  AudioOutlined,
-  FileTextOutlined,
-  TrophyOutlined,
-  AppstoreOutlined,
-  HistoryOutlined,
-  ControlOutlined,
-  CrownOutlined,
-  ScanOutlined,
-  EditOutlined,
-  FolderOutlined,
-} from "@ant-design/icons";
-
-/** 导航项定义 */
-export interface NavItem {
-  key: string;
-  label: string;
-  path: string;
-  icon: React.ReactNode;
-}
-
-/** 导航分组定义 */
-export interface NavGroup {
-  title: string;
-  items: NavItem[];
-}
-
-/**
- * 扁平导航列表（Header 使用）
- */
-export const NAV_ITEMS: NavItem[] = [
-  {
-    key: "dashboard",
-    label: "概览",
-    path: "/app/dashboard",
-    icon: <DashboardOutlined />,
-  },
-  {
-    key: "assets",
-    label: "素材库",
-    path: "/app/assets",
-    icon: <FileOutlined />,
-  },
-  {
-    key: "titles",
-    label: "标题库",
-    path: "/app/titles",
-    icon: <FileTextOutlined />,
-  },
-  {
-    key: "voices",
-    label: "配音库",
-    path: "/app/voices",
-    icon: <AudioOutlined />,
-  },
-  {
-    key: "voice-clone",
-    label: "我的音色",
-    path: "/app/voice-clone",
-    icon: <AudioOutlined />,
-  },
-  {
-    key: "voice-materials",
-    label: "配音素材库",
-    path: "/app/voice-materials",
-    icon: <AudioOutlined />,
-  },
-  {
-    key: "templates",
-    label: "模板库",
-    path: "/app/templates",
-    icon: <AppstoreOutlined />,
-  },
-  {
-    key: "editing-planner",
-    label: "剪辑编辑器",
-    path: "/app/editing-planner",
-    icon: <EditOutlined />,
-  },
-  {
-    key: "my-templates",
-    label: "我的模板",
-    path: "/app/my-templates",
-    icon: <FolderOutlined />,
-  },
-  {
-    key: "generate",
-    label: "一键生成",
-    path: "/app/generate",
-    icon: <VideoCameraOutlined />,
-  },
-  {
-    key: "history",
-    label: "任务历史",
-    path: "/app/history",
-    icon: <HistoryOutlined />,
-  },
-  {
-    key: "products",
-    label: "成品库",
-    path: "/app/products",
-    icon: <TrophyOutlined />,
-  },
-  {
-    key: "duplication",
-    label: "查重",
-    path: "/app/duplication",
-    icon: <ScanOutlined />,
-  },
-];
-
-/**
- * 分组导航列表（Sidebar 使用）
- */
-export const NAV_GROUPS: NavGroup[] = [
-  {
-    title: "创作工具",
-    items: [
-      {
-        key: "dashboard",
-        label: "首页",
-        path: "/app/dashboard",
-        icon: <DashboardOutlined />,
-      },
-      {
-        key: "generate",
-        label: "一键生成",
-        path: "/app/generate",
-        icon: <VideoCameraOutlined />,
-      },
-    ],
-  },
-  {
-    title: "资源管理",
-    items: [
-      {
-        key: "assets",
-        label: "素材库",
-        path: "/app/assets",
-        icon: <FileOutlined />,
-      },
-      {
-        key: "voices",
-        label: "配音库",
-        path: "/app/voices",
-        icon: <AudioOutlined />,
-      },
-      {
-        key: "voice-clone",
-        label: "我的音色",
-        path: "/app/voice-clone",
-        icon: <AudioOutlined />,
-      },
-      {
-        key: "voice-materials",
-        label: "配音素材库",
-        path: "/app/voice-materials",
-        icon: <AudioOutlined />,
-      },
-      {
-        key: "titles",
-        label: "标题库",
-        path: "/app/titles",
-        icon: <FileTextOutlined />,
-      },
-      {
-        key: "products",
-        label: "成片库",
-        path: "/app/products",
-        icon: <TrophyOutlined />,
-      },
-      {
-        key: "templates",
-        label: "模板库",
-        path: "/app/templates",
-        icon: <AppstoreOutlined />,
-      },
-    ],
-  },
-  {
-    title: "系统",
-    items: [
-      {
-        key: "history",
-        label: "任务历史",
-        path: "/app/history",
-        icon: <HistoryOutlined />,
-      },
-      {
-        key: "admin",
-        label: "控制台",
-        path: "/app/admin",
-        icon: <ControlOutlined />,
-      },
-      {
-        key: "subscription",
-        label: "订阅管理",
-        path: "/app/subscription",
-        icon: <CrownOutlined />,
-      },
-    ],
-  },
-];

apps/web/src/pages/admin/Admin.css

@@ -75,35 +75,6 @@
   margin: 0;
 }
 
-/* V21 卡片 */
-.xx-card {
-  background: rgba(255, 255, 255, 0.94);
-  border: 1px solid rgba(226, 232, 240, 0.95);
-  border-radius: var(--radius-lg);
-  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
-  padding: 24px;
-  transition: all 0.3s;
-}
-
-.xx-card:hover {
-  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
-}
-
-.xx-card .ant-card-head {
-  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
-  padding: 20px 24px;
-}
-
-.xx-card .ant-card-head-title {
-  font-weight: 800;
-  font-size: 17px;
-  color: var(--slate, #0f172a);
-}
-
-.xx-card .ant-card-body {
-  padding: 24px;
-}
-
 /* 统计卡片网格 - 4列 */
 .xx-grid-4 {
   display: grid;
@@ -302,17 +273,6 @@
   box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1) !important;
 }
 
-/* V21 Select */
-.xx-select {
-  border-radius: var(--radius-md) !important;
-}
-
-.xx-select:hover,
-.xx-select:focus {
-  border-color: var(--indigo, #4f46e5) !important;
-  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1) !important;
-}
-
 /* V21 Tag */
 .xx-tag {
   border-radius: var(--radius-xs) !important;

apps/web/src/pages/generate/generate.css

@@ -612,54 +612,6 @@
   flex: 1;
 }
 
-/* ============================================================
-   按钮（匹配原型 .btn .ghost / .btn .primary）
-   ============================================================ */
-.xx-btn {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: 6px;
-  height: 42px;
-  padding: 0 20px;
-  border-radius: var(--radius-sm);
-  font-size: 14px;
-  font-weight: 600;
-  cursor: pointer;
-  transition: all 0.15s ease;
-  border: none;
-  outline: none;
-  white-space: nowrap;
-}
-
-.xx-btn:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
-}
-
-.xx-btn-primary {
-  background: var(--gradient-primary);
-  color: var(--text-inverse);
-  box-shadow: 0 14px 26px rgba(79, 70, 229, 0.22);
-}
-
-.xx-btn-primary:hover:not(:disabled) {
-  transform: translateY(-2px);
-  box-shadow: 0 18px 34px rgba(79, 70, 229, 0.28);
-}
-
-.xx-btn-ghost {
-  background: var(--bg-primary);
-  border: 1px solid var(--border-color);
-  color: var(--text-secondary);
-}
-
-.xx-btn-ghost:hover:not(:disabled) {
-  border-color: var(--info-border);
-  color: var(--primary-dark);
-  background: var(--primary-soft);
-}
-
 /* ============================================================
    右侧预览区 generate-preview
    ============================================================ */

apps/web/src/router/index.tsx

@@ -170,13 +170,6 @@ export const router = createBrowserRouter([
             Component: m.default,
           })),
       },
-      {
-        path: "my-voices",
-        lazy: () =>
-          import("@/pages/my-voices/MyVoices").then((m) => ({
-            Component: m.default,
-          })),
-      },
       {
         path: "accounts",
         lazy: () =>

apps/worker/worker_app/tasks/generation.py

@@ -113,8 +113,8 @@ from video_processing.oss_helpers import (
     get_signed_download_url,
     upload_to_oss,
 )
-from video_processing.render_engine_resolver import ENGINE_LEGACY, ENGINE_UNIFIED
 from video_processing.unified_render_service import UnifiedRenderService
+from video_processing.render_engine_resolver import ENGINE_LEGACY, ENGINE_UNIFIED
 
 # ── 虚拟 Plan / Clip（内存中构建，不写数据库） ────────────────────────────────
 
@@ -619,8 +619,7 @@ def _render_with_legacy_engine(
     import subprocess
 
     main_clips = [
-        c
-        for c in virtual_clips
+        c for c in virtual_clips
         if c.clip_type in ("main", "b_roll", "background")
         or (c.clip_type == "main" and c.config.get("role") == "b_roll")
     ]
@@ -675,27 +674,17 @@ def _render_with_legacy_engine(
     filter_complex = ";".join(fc_parts)
 
     command = [
-        FFMPEG_BIN,
-        "-y",
+        FFMPEG_BIN, "-y",
         *input_args,
-        "-filter_complex",
-        filter_complex,
-        "-map",
-        video_label,
-        "-map",
-        audio_label,
-        "-c:v",
-        "libx264",
-        "-crf",
-        "23",
-        "-preset",
-        "medium",
-        "-c:a",
-        "aac",
-        "-b:a",
-        "192k",
-        "-movflags",
-        "+faststart",
+        "-filter_complex", filter_complex,
+        "-map", video_label,
+        "-map", audio_label,
+        "-c:v", "libx264",
+        "-crf", "23",
+        "-preset", "medium",
+        "-c:a", "aac",
+        "-b:a", "192k",
+        "-movflags", "+faststart",
         str(output_path),
     ]
 
@@ -705,9 +694,7 @@ def _render_with_legacy_engine(
     except subprocess.CalledProcessError as e:
         logger.error(
             "[task_id=%s] [渲染] legacy 引擎 FFmpeg 失败: %s\nfilter_complex: %s",
-            task_id,
-            e,
-            filter_complex[:500],
+            task_id, e, filter_complex[:500],
         )
         raise
 
@@ -893,9 +880,7 @@ def generate_video(self, task_id: str) -> dict:
                 render_elapsed = time.monotonic() - render_start
                 logger.info(
                     "[task_id=%s] [渲染] legacy 引擎完成: 耗时=%.1fs, 时长=%.2fs",
-                    task_id,
-                    render_elapsed,
-                    render_duration,
+                    task_id, render_elapsed, render_duration,
                 )
             else:
                 # 新引擎：UnifiedRenderService 图层架构
@@ -916,8 +901,7 @@ def generate_video(self, task_id: str) -> dict:
                 render_elapsed = time.monotonic() - render_start
                 logger.info(
                     "[task_id=%s] [渲染] unified 引擎完成: 耗时=%.1fs",
-                    task_id,
-                    render_elapsed,
+                    task_id, render_elapsed,
                 )
 
             if gen_task:

tests/unit/test_generation_feature_flag.py

@@ -19,9 +19,8 @@ from unittest.mock import MagicMock, patch
 os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
 os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")
 
-from pathlib import Path
-
 import pytest
+from pathlib import Path
 
 # ── Mock worker 模块以避免数据库连接 ──────────────────────────────────────────
 
@@ -69,12 +68,11 @@ class _TestClip:
 
 def test_resolver_unified_when_enabled_100_percent():
     """flag 全局开启（percentage=100）时，返回 unified。"""
-    from video_processing.render_engine_resolver import RenderEngineResolver
-
     from packages.adapters.redis.feature_flag_store import (
         FeatureFlagConfig,
         InMemoryFeatureFlagStore,
     )
+    from video_processing.render_engine_resolver import RenderEngineResolver
 
     store = InMemoryFeatureFlagStore()
     store.set(FeatureFlagConfig(name="render_engine", enabled=True, percentage=100))
@@ -85,12 +83,11 @@ def test_resolver_unified_when_enabled_100_percent():
 
 def test_resolver_legacy_when_flag_disabled():
     """flag 全局关闭时，返回默认引擎 legacy。"""
-    from video_processing.render_engine_resolver import RenderEngineResolver
-
     from packages.adapters.redis.feature_flag_store import (
         FeatureFlagConfig,
         InMemoryFeatureFlagStore,
     )
+    from video_processing.render_engine_resolver import RenderEngineResolver
 
     store = InMemoryFeatureFlagStore()
     store.set(FeatureFlagConfig(name="render_engine", enabled=False, percentage=100))
@@ -101,12 +98,11 @@ def test_resolver_legacy_when_flag_disabled():
 
 def test_resolver_whitelist_overrides_percentage_0():
     """白名单用户即使 percentage=0 也走 unified。"""
-    from video_processing.render_engine_resolver import RenderEngineResolver
-
     from packages.adapters.redis.feature_flag_store import (
         FeatureFlagConfig,
         InMemoryFeatureFlagStore,
     )
+    from video_processing.render_engine_resolver import RenderEngineResolver
 
     store = InMemoryFeatureFlagStore()
     store.set(
@@ -125,12 +121,11 @@ def test_resolver_whitelist_overrides_percentage_0():
 
 def test_resolver_percentage_0_all_legacy():
     """percentage=0 且无白名单时，全部走 legacy。"""
-    from video_processing.render_engine_resolver import RenderEngineResolver
-
     from packages.adapters.redis.feature_flag_store import (
         FeatureFlagConfig,
         InMemoryFeatureFlagStore,
     )
+    from video_processing.render_engine_resolver import RenderEngineResolver
 
     store = InMemoryFeatureFlagStore()
     store.set(FeatureFlagConfig(name="render_engine", enabled=True, percentage=0))
@@ -142,12 +137,11 @@ def test_resolver_percentage_0_all_legacy():
 
 def test_resolver_default_unified_when_flag_off():
     """默认引擎设为 unified 且 flag 关闭时，返回 unified。"""
-    from video_processing.render_engine_resolver import RenderEngineResolver
-
     from packages.adapters.redis.feature_flag_store import (
         FeatureFlagConfig,
         InMemoryFeatureFlagStore,
     )
+    from video_processing.render_engine_resolver import RenderEngineResolver
 
     store = InMemoryFeatureFlagStore()
     store.set(FeatureFlagConfig(name="render_engine", enabled=False, percentage=0))
@@ -176,23 +170,11 @@ def test_legacy_engine_single_clip_keeps_original_fps():
         # 生成 1 秒 30fps 测试视频（带音频）
         subprocess.run(
             [
-                "ffmpeg",
-                "-y",
-                "-f",
-                "lavfi",
-                "-i",
-                "color=c=red:s=640x360:d=1:r=30",
-                "-f",
-                "lavfi",
-                "-i",
-                "anullsrc=r=44100:cl=stereo:d=1",
-                "-c:v",
-                "libx264",
-                "-pix_fmt",
-                "yuv420p",
-                "-c:a",
-                "aac",
-                "-shortest",
+                "ffmpeg", "-y",
+                "-f", "lavfi", "-i", "color=c=red:s=640x360:d=1:r=30",
+                "-f", "lavfi", "-i", "anullsrc=r=44100:cl=stereo:d=1",
+                "-c:v", "libx264", "-pix_fmt", "yuv420p",
+                "-c:a", "aac", "-shortest",
                 str(input_path),
             ],
             check=True,
@@ -240,23 +222,11 @@ def test_legacy_engine_two_clips_concat_duration():
             color = "red" if idx == 0 else "blue"
             subprocess.run(
                 [
-                    "ffmpeg",
-                    "-y",
-                    "-f",
-                    "lavfi",
-                    "-i",
-                    f"color=c={color}:s=640x360:d=1:r=30",
-                    "-f",
-                    "lavfi",
-                    "-i",
-                    "anullsrc=r=44100:cl=stereo:d=1",
-                    "-c:v",
-                    "libx264",
-                    "-pix_fmt",
-                    "yuv420p",
-                    "-c:a",
-                    "aac",
-                    "-shortest",
+                    "ffmpeg", "-y",
+                    "-f", "lavfi", "-i", f"color=c={color}:s=640x360:d=1:r=30",
+                    "-f", "lavfi", "-i", "anullsrc=r=44100:cl=stereo:d=1",
+                    "-c:v", "libx264", "-pix_fmt", "yuv420p",
+                    "-c:a", "aac", "-shortest",
                     str(inp),
                 ],
                 check=True,
@@ -294,23 +264,11 @@ def test_legacy_engine_broll_mode_supported():
 
         subprocess.run(
             [
-                "ffmpeg",
-                "-y",
-                "-f",
-                "lavfi",
-                "-i",
-                "color=c=green:s=640x360:d=1:r=30",
-                "-f",
-                "lavfi",
-                "-i",
-                "anullsrc=r=44100:cl=stereo:d=1",
-                "-c:v",
-                "libx264",
-                "-pix_fmt",
-                "yuv420p",
-                "-c:a",
-                "aac",
-                "-shortest",
+                "ffmpeg", "-y",
+                "-f", "lavfi", "-i", "color=c=green:s=640x360:d=1:r=30",
+                "-f", "lavfi", "-i", "anullsrc=r=44100:cl=stereo:d=1",
+                "-c:v", "libx264", "-pix_fmt", "yuv420p",
+                "-c:a", "aac", "-shortest",
                 str(input_path),
             ],
             check=True,
@@ -318,10 +276,8 @@ def test_legacy_engine_broll_mode_supported():
         )
 
         clip = _TestClip(
-            asset_id="asset-1",
-            duration=1.0,
-            clip_type="main",
-            config={"role": "b_roll"},
+            asset_id="asset-1", duration=1.0,
+            clip_type="main", config={"role": "b_roll"},
         )
         asset_path_map = {"asset-1": input_path}