新增获取全部知识库的接口，api版本号重归到v1

backend/services/crawler_service.py

@@ -30,6 +30,11 @@ class CrawlerService:
         self._active_workers: Dict[int, set] = {} 
         self._lock = threading.Lock()
 
+    def get_knowledge_base_list(self):
+        """获取知识库列表"""
+        return data_service.get_all_tasks()
+
+
     def _track_start(self, task_id: int, url: str):
         """[Internal] 标记某个URL开始处理"""
         with self._lock: