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问题：
1. 之前 Worker 用 MediaKit 网络抽帧写 cover_url，因状态字符串 bug（#1461 已修）
一直失败；且在 API 请求内同步抽帧易超时。
2. 封面从源素材抽取时无标题（源素材未烧录标题）。
修复：
1. Worker 渲染完成后直接复用 RenderAdapter 已用本地 ffmpeg 抽出的 cover_candidates：
- _render_video 返回值改为 (output_path, render_duration, cover_candidates)
- 第一帧写入 gen_task.cover_url，完整列表写入 metadata.cover_candidates
- 删除步骤 4.5 的 MediaKit 抽帧代码（不依赖网络，不阻塞）
2. 标题叠加：
- 新增 packages/shared/title_overlay.py，Pillow 绘制白色文字+黑色描边/阴影，
支持 CJK 字体和自动换行（API/Worker 共用）
- thumbnail_generator.extract_and_upload_cover_frames 的 title_text 参数真正生效
- render_adapter 从已渲染视频抽帧时传空 title_text（标题已 ASS 烧录，避免重影）
- 封面 API E2 从源素材抽帧后，从 plan.config.title.text 读取标题并叠加
3. API 基础镜像增加 Pillow 和 fonts-noto-cjk（E2 标题叠加依赖）
测试：新增 test_title_overlay.py（5）、E2 标题透传测试，更新 1294 解包；
相关 51 passed。