feat: 递归导入只需输入NodeToken，自动获取SpaceID

- feishu_service.py: import_nodes_from_parent 去掉 space_id 参数，
  通过 get_node_info 自动获取 space_id
- admin_knowledge.py: import API 去掉 spaceId 参数
- App.vue: 前端去掉 SpaceID 输入框，只需输入 NodeToken

ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge.py

@@ -28,12 +28,11 @@ def import_knowledge_from_space(
     db: Session = Depends(get_db),
     current_admin: Admin = Depends(get_current_admin),
 ) -> dict:
-    space_id = payload.get("spaceId", "").strip()
     parent_node_token = payload.get("parent_node_token", "").strip()
-    if not space_id or not parent_node_token:
-        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="SpaceID 和父节点 Token 不能为空")
+    if not parent_node_token:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="父节点 NodeToken 不能为空")
 
-    nodes = FeishuKnowledgeService.import_nodes_from_parent(space_id, parent_node_token, db)
+    nodes = FeishuKnowledgeService.import_nodes_from_parent(parent_node_token, db)
     if not nodes:
         return api_success({"imported": 0, "skipped": 0, "nodes": []})