feat: 剪辑计划片段CRUD API - 列表/详情/创建/更新/删除

新增 edit_plans_clips.py 路由模块，暴露 5 个接口：
- GET    /{plan_id}/clips              获取片段列表（支持状态过滤+分页）
- POST   /{plan_id}/clips              创建片段
- GET    /{plan_id}/clips/{clip_id}    获取片段详情
- PUT    /{plan_id}/clips/{clip_id}    更新片段
- DELETE /{plan_id}/clips/{clip_id}    删除片段

复用 EditPlanService 已有的 clip CRUD 方法
支持项目级权限校验（通过 plan.project_id 关联）
自动触发编辑状态回退（编辑时从 completed/failed 切回 editing）

apps/api/app/api/routes/edit_plans.py

@@ -460,9 +460,11 @@ def delete_plan(
 # ── Include sub-routers (拆分模块) ────────────────────────────────────────────
 
 from .edit_plans_ai import router as ai_router
+from .edit_plans_clips import router as clips_router
 from .edit_plans_generation import router as generation_router
 from .edit_plans_timeline import router as timeline_router
 
 router.include_router(generation_router)
 router.include_router(ai_router)
 router.include_router(timeline_router)
+router.include_router(clips_router, prefix="/{plan_id}/clips", tags=["EditPlan Clips"])

apps/api/app/api/routes/edit_plans_clips.py

@@ -0,0 +1,275 @@
+"""剪辑计划片段（Clip）CRUD 路由。"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any, List, Optional
+
+from app.auth import AuthenticatedUser, get_current_user
+from app.dependencies import get_db_session, get_project_repository
+from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
+from sqlalchemy.orm import Session
+
+from packages.domain.edit_plan_clip import EditPlanClipStatus
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+# ── Schemas ──────────────────────────────────────────────────────────────────
+
+from pydantic import BaseModel, Field
+
+
+class EditPlanClipResponse(BaseModel):
+    """剪辑片段响应体"""
+
+    id: str
+    plan_id: str
+    clip_type: str
+    order: int
+    asset_id: str = ""
+    text_content: str = ""
+    start_time: float = 0.0
+    duration: float = 0.0
+    transition_effect: str = "cut"
+    transition_duration: float = 0.0
+    playback_speed: float = 1.0
+    status: str
+    config: dict[str, Any] = Field(default_factory=dict)
+    created_at: Optional[str] = None
+    updated_at: Optional[str] = None
+
+
+class EditPlanClipListResponse(BaseModel):
+    """剪辑片段列表响应体"""
+
+    items: List[EditPlanClipResponse]
+    total: int
+
+
+class EditPlanClipCreateRequest(BaseModel):
+    """创建剪辑片段请求体"""
+
+    clip_type: str = Field(..., min_length=1, max_length=50, description="片段类型: main/intro/outro/overlay/background/b_roll 等")
+    order: int = Field(..., ge=0, description="排序序号")
+    asset_id: str = Field(default="", max_length=64, description="关联素材 ID")
+    text_content: str = Field(default="", max_length=5000, description="文本内容（字幕/配音等）")
+    start_time: float = Field(default=0.0, ge=0.0, description="起始时间 (秒)")
+    duration: float = Field(default=0.0, ge=0.0, description="时长 (秒)")
+    transition_effect: str = Field(default="cut", max_length=50, description="转场效果")
+    transition_duration: float = Field(default=0.0, ge=0.0, description="转场时长 (秒)")
+    playback_speed: float = Field(default=1.0, gt=0.0, le=10.0, description="播放速度倍率")
+    config: dict[str, Any] = Field(default_factory=dict, description="扩展配置 (JSON)")
+
+
+class EditPlanClipUpdateRequest(BaseModel):
+    """更新剪辑片段请求体"""
+
+    clip_type: Optional[str] = Field(default=None, min_length=1, max_length=50, description="片段类型")
+    order: Optional[int] = Field(default=None, ge=0, description="排序序号")
+    asset_id: Optional[str] = Field(default=None, max_length=64, description="关联素材 ID")
+    text_content: Optional[str] = Field(default=None, max_length=5000, description="文本内容")
+    start_time: Optional[float] = Field(default=None, ge=0.0, description="起始时间 (秒)")
+    duration: Optional[float] = Field(default=None, ge=0.0, description="时长 (秒)")
+    transition_effect: Optional[str] = Field(default=None, max_length=50, description="转场效果")
+    transition_duration: Optional[float] = Field(default=None, ge=0.0, description="转场时长 (秒)")
+    playback_speed: Optional[float] = Field(default=None, gt=0.0, le=10.0, description="播放速度倍率")
+    config: Optional[dict[str, Any]] = Field(default=None, description="扩展配置 (JSON)")
+
+
+# ── Helpers ──────────────────────────────────────────────────────────────────
+
+
+def _check_plan_access(plan_id: str, user_id: str, project_repository: Any, db: Session) -> Any:
+    """验证用户是否有权限访问该剪辑计划（通过项目关联）。
+    返回 plan 对象供后续使用，避免重复查询。
+    """
+    from ._helpers import check_project_access
+    from app.services.edit_plan_service import EditPlanService
+
+    svc = EditPlanService(db)
+    plan = svc.get_plan(plan_id)
+    if plan is None:
+        raise HTTPException(status_code=404, detail=f"剪辑计划不存在: {plan_id}")
+    if plan.project_id:
+        check_project_access(plan.project_id, user_id, project_repository)
+    return plan
+
+
+def _clip_to_response(clip) -> EditPlanClipResponse:
+    """将领域对象转换为响应体"""
+    return EditPlanClipResponse(
+        id=clip.id,
+        plan_id=clip.plan_id,
+        clip_type=clip.clip_type,
+        order=clip.order,
+        asset_id=clip.asset_id or "",
+        text_content=clip.text_content or "",
+        start_time=clip.start_time,
+        duration=clip.duration,
+        transition_effect=clip.transition_effect or "cut",
+        transition_duration=clip.transition_duration or 0.0,
+        playback_speed=clip.playback_speed or 1.0,
+        status=clip.status.value if hasattr(clip.status, "value") else str(clip.status),
+        config=clip.config or {},
+        created_at=clip.created_at.isoformat() if clip.created_at else None,
+        updated_at=clip.updated_at.isoformat() if clip.updated_at else None,
+    )
+
+
+def _get_svc(db: Session):
+    """获取 EditPlanService 实例"""
+    from app.services.edit_plan_service import EditPlanService
+
+    return EditPlanService(db)
+
+
+# ── Routes ───────────────────────────────────────────────────────────────────
+
+
+@router.get("", response_model=EditPlanClipListResponse)
+def list_clips(
+    plan_id: str,
+    status_filter: Optional[str] = Query(None, alias="status", description="按状态过滤"),
+    skip: int = Query(0, ge=0, description="分页偏移"),
+    limit: int = Query(100, ge=1, le=500, description="每页数量"),
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+    project_repository: Any = Depends(get_project_repository),
+) -> EditPlanClipListResponse:
+    """获取剪辑计划的片段列表"""
+    _check_plan_access(plan_id, current_user.user.id, project_repository, db)
+
+    svc = _get_svc(db)
+    status_enum = EditPlanClipStatus(status_filter) if status_filter else None
+    clips = svc.list_clips(plan_id, status=status_enum, skip=skip, limit=limit)
+    total = svc.count_clips(plan_id, status=status_enum)
+
+    return EditPlanClipListResponse(
+        items=[_clip_to_response(c) for c in clips],
+        total=total,
+    )
+
+
+@router.post("", response_model=EditPlanClipResponse, status_code=status.HTTP_201_CREATED)
+def create_clip(
+    plan_id: str,
+    body: EditPlanClipCreateRequest,
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+    project_repository: Any = Depends(get_project_repository),
+) -> EditPlanClipResponse:
+    """创建剪辑片段"""
+    _check_plan_access(plan_id, current_user.user.id, project_repository, db)
+
+    svc = _get_svc(db)
+    try:
+        clip = svc.create_clip(
+            plan_id=plan_id,
+            clip_type=body.clip_type,
+            order=body.order,
+            asset_id=body.asset_id,
+            text_content=body.text_content,
+            start_time=body.start_time,
+            duration=body.duration,
+            transition_effect=body.transition_effect,
+            transition_duration=body.transition_duration,
+            playback_speed=body.playback_speed,
+            config=body.config,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e)) from e
+
+    logger.info("创建剪辑片段: plan_id=%s clip_id=%s by user=%s", plan_id, clip.id, current_user.user.id)
+    return _clip_to_response(clip)
+
+
+@router.get("/{clip_id}", response_model=EditPlanClipResponse)
+def get_clip(
+    plan_id: str,
+    clip_id: str,
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+    project_repository: Any = Depends(get_project_repository),
+) -> EditPlanClipResponse:
+    """获取剪辑片段详情"""
+    _check_plan_access(plan_id, current_user.user.id, project_repository, db)
+
+    svc = _get_svc(db)
+    clip = svc.get_clip(clip_id)
+    if clip is None:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+    if clip.plan_id != plan_id:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+
+    return _clip_to_response(clip)
+
+
+@router.put("/{clip_id}", response_model=EditPlanClipResponse)
+def update_clip(
+    plan_id: str,
+    clip_id: str,
+    body: EditPlanClipUpdateRequest,
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+    project_repository: Any = Depends(get_project_repository),
+) -> EditPlanClipResponse:
+    """更新剪辑片段"""
+    _check_plan_access(plan_id, current_user.user.id, project_repository, db)
+
+    svc = _get_svc(db)
+    # 验证 clip 属于该 plan
+    clip = svc.get_clip(clip_id)
+    if clip is None:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+    if clip.plan_id != plan_id:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+
+    try:
+        updated = svc.update_clip(
+            clip_id,
+            clip_type=body.clip_type,
+            order=body.order,
+            asset_id=body.asset_id,
+            text_content=body.text_content,
+            start_time=body.start_time,
+            duration=body.duration,
+            transition_effect=body.transition_effect,
+            transition_duration=body.transition_duration,
+            playback_speed=body.playback_speed,
+            config=body.config,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e)) from e
+
+    logger.info("更新剪辑片段: plan_id=%s clip_id=%s by user=%s", plan_id, clip_id, current_user.user.id)
+    return _clip_to_response(updated)
+
+
+@router.delete("/{clip_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None, response_class=Response)
+def delete_clip(
+    plan_id: str,
+    clip_id: str,
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+    project_repository: Any = Depends(get_project_repository),
+) -> None:
+    """删除剪辑片段"""
+    _check_plan_access(plan_id, current_user.user.id, project_repository, db)
+
+    svc = _get_svc(db)
+    # 验证 clip 属于该 plan
+    clip = svc.get_clip(clip_id)
+    if clip is None:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+    if clip.plan_id != plan_id:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+
+    deleted = svc.delete_clip(clip_id)
+    if not deleted:
+        raise HTTPException(status_code=404, detail=f"片段不存在: {clip_id}")
+
+    logger.info("删除剪辑片段: plan_id=%s clip_id=%s by user=%s", plan_id, clip_id, current_user.user.id)
+    return None