refactor: remove publisher, add auto DB sync, clean backups, update docs

platform/backend/app/api/topics.py

@@ -177,22 +177,6 @@ def list_packages(topic_id: str):
     return {"packages": packages}
 
 
-@router.post("/{topic_id}/packages/generate")
-def generate_packages(topic_id: str):
-    """
-    手动触发单个选题的发布包生成。
-    相当于执行 publisher.py 针对单个选题。
-    """
-    from ..core.publisher import run_publisher
-    result = run_publisher(topic_id)
-    if not result["ok"]:
-        raise HTTPException(status_code=500, detail=result["error"])
-    return {
-        "message": f"Package generation completed for topic {topic_id}",
-        "topic_id": topic_id,
-        "output": result.get("result", "")
-    }
-
 @router.delete("/{topic_id}")
 def delete_topic(topic_id: str, db: Session = Depends(get_db)):
     """删除选题"""