feat: add generation trace and partial-ready workflow status

README.md

@@ -131,6 +131,9 @@ npm run build
 | POST | `/api/generations` | 统一生成故事或绘本 |
 | GET | `/api/generations/{story_id}` | 统一读取生成结果 |
 | POST | `/api/generations/{story_id}/retry-assets` | 统一重试封面/语音资源 |
+| GET | `/api/generations/jobs/{job_id}` | 查询生成任务事件流 |
+| GET | `/api/generations/{story_id}/jobs` | 查询故事生成与重试历史 |
+| GET | `/api/generations/{story_id}/provider-stats` | 查询 Provider 调用聚合指标 |
 | GET | `/api/stories` | 故事列表 |
 | GET | `/api/stories/{story_id}` | 故事详情 |
 | DELETE | `/api/stories/{story_id}` | 删除故事 |