feat(web): #2001 爆款标题样式配置面板升级 + ai-avatar 配音面板清理emotion

- 新增描边宽色/阴影参数/行距/上边距/maxCharsPerLine/背景色块/逐行/封面独立配置
- 4款爆款字体 + 抖音爆款黄预设
- 共享 TitleStylePanel + TitleMiniPreview Canvas预览
- 全链路适配（Canvas/contract/useGenerateVideo/useBatchCovers/usePlanConfigLoader）
- CreateGenerationTaskRequest/GenerateCoverTitleConfig 类型扩展
- ai-avatar: 删除情绪下拉框，tts-preview补传style，lipsync去emotion参数
- normalizeEmotion 工具函数保留

apps/web/src/api/generation/cover.ts

@@ -7,8 +7,19 @@ export interface GenerateCoverTitleConfig {
   font_color?: string
   position?: string
   bold?: boolean
-  stroke?: boolean
-  shadow?: boolean
+  italic?: boolean
+  stroke?: boolean | { enabled?: boolean; width?: number; color?: string }
+  shadow?:
+    | boolean
+    | { enabled?: boolean; offset_x?: number; offset_y?: number; blur?: number; color?: string }
+  line_height?: number
+  margin_top?: number
+  max_chars_per_line?: number
+  background?: { enabled?: boolean; color?: string; padding?: number; radius?: number }
+  line_overrides?: Array<Record<string, unknown>>
+  cover_title_config?: Record<string, unknown>
+  pos_x?: number
+  pos_y?: number
 }
 
 export interface GenerateCoverRequest {