feat: 审查流程优化+采集定时调度+全链路LLM提示词升级

- 审查：移除 manual_review，改为迭代LLM修复(最多3次)，合规分回写Topic
- 调度：scheduler 新增话题采集定时任务 scheduled_collect (01:30)
- 提示词：全链路8文件≈24个提示词升级，增强SEO/平台推荐/真人感

scripts/db_helper.py

@@ -61,7 +61,7 @@ def get_next_topic(priority: Optional[str] = None, db: Optional[Session] = None)
         if close_db:
             db.close()
 
-def update_topic_status(topic_id: str, status: str, db: Optional[Session] = None) -> bool:
+def update_topic_status(topic_id: str, status: str, compliance_score: Optional[int] = None, db: Optional[Session] = None) -> bool:
     close_db = False
     if db is None:
         db = SessionLocal()
@@ -72,6 +72,8 @@ def update_topic_status(topic_id: str, status: str, db: Optional[Session] = None
             return False
         topic.status = status
         topic.updated_at = datetime.now()
+        if compliance_score is not None:
+            topic.compliance_score = compliance_score
         if status in ['ready', 'published'] and topic.generated_at is None:
             topic.generated_at = datetime.now()
         db.commit()