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## 统一渲染引擎 Phase 2 - Feature Flag 开关 + 适配层 ### 变更内容 1. **Feature Flag 开关** - API 端 `Settings.RENDER_ENGINE`（默认 `legacy`） - Worker 端 `WorkerSettings.render_engine`（默认 `legacy`） - 支持环境变量 `RENDER_ENGINE=unified` 一键切换 2. **RenderAdapter 适配层** (`apps/worker/video_processing/render_adapter.py`) - EditPlan + EditPlanClips → UnifiedRenderService 输入的完整适配 - 素材自动下载（OSS → 本地路径映射） - 进度回调对接（ProgressCallback） - 结果自动上传 OSS - `validate_plan()` 兼容旧接口，便于灰度切换 3. **compose_video 任务改造** - 根据 `RENDER_ENGINE` 配置分流到 legacy / unified 路径 - 新引擎结果回写字段对齐（engine/width/height/file_size） - 错误处理与重试逻辑保持一致 ### 测试 - 新增 16 个单元测试：validate_plan(7) + render_plan(6) + download_assets(3) - 原有 52 个 unified_render_service 测试全部通过 - 合计 **68 个测试全绿** ### 灰度策略 - 默认 `legacy`，不影响现有功能 - 灰度时设置环境变量 `RENDER_ENGINE=unified` 即可切换 - 后续可支持按 plan_id / user_id 灰度（Phase 3） --------- Co-authored-by: 灵应 <lingying@coze.email> Reviewed-on: #231