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## 问题根因
generate_video Celery 任务完全没有状态更新逻辑：
- 任务开始执行时，不更新 GenerationTask 状态为 running
- 任务成功时，不更新状态为 completed
- 任务失败时，不更新状态为 failed
- GenerationTask 领域模型缺少 mark_processing/mark_completed/mark_failed 方法
结果：任务状态永远停留在 pending，前端查询时一直显示"生成中"或超时显示失败，即使视频实际上已经生成成功了。
## 修复方案
### 1. GenerationTask 领域模型增加完整状态机
- 新增 TERMINAL_STATUSES 终态集合
- 新增 _VALID_TRANSITIONS 合法状态转换表
- 新增 transition_to() 通用状态转换方法（含合法性校验）
- 新增 mark_processing() — pending → running，设置 started_at
- 新增 mark_completed(result_count) — running → completed，设置 completed_at/progress/result_count
- 新增 mark_failed(error_message) — pending/running → failed，设置 error_message/completed_at
- 新增 mark_cancelled() — pending/running → cancelled
- 新增 mark_pending_from_failed() — failed → pending（用于重试）
- 新增 is_terminal/is_completed/is_failed/is_running 属性
状态机：
pending → running → completed
↘ failed → pending (重试)
↘ cancelled
### 2. generate_video Celery 任务增加状态更新
- 新增 _update_task_status() 辅助函数：独立 session + 异常隔离
- 任务开始时：调用 mark_processing() 更新为 running
- 任务成功时：调用 mark_completed() 更新为 completed，传入视频数量
- 任务失败时：在 except 块中调用 mark_failed() 记录错误信息
- _create_video_record_and_dedup 返回值改为 int，方便统计成功数量
状态更新使用独立数据库 session，且所有状态更新操作都包裹在 try/except 中，确保不会因为状态更新失败导致整个任务异常。
### 3. 新增状态机单元测试
新增 tests/unit/test_generation_task_status.py，覆盖 42 个测试用例：
- 初始状态验证
- mark_processing 正常/异常路径
- mark_completed 正常/异常路径
- mark_failed 正常/异常路径
- mark_cancelled 正常/异常路径
- mark_pending_from_failed 重试路径
- transition_to 通用方法
- 完整流转路径（成功、失败、重试、取消）
## 影响范围
- packages/domain/generation_task.py — 领域模型状态机方法
- apps/worker/worker_app/tasks/generation.py — Celery 任务状态更新
- tests/unit/test_generation_task_status.py — 新增单元测试
## 验证方式
- 42 个状态机单元测试全部通过
- 现有 8 个生成相关测试全部通过
- 现有 15 个生成 API 集成测试全部通过
- 现有 6 个编辑计划 worker 失败测试全部通过
- 现有 25 个生成视频管理测试全部通过