chore: remove unused api (#611)

Author: iziang

kubechat/views/main.py

@@ -369,14 +369,6 @@ async def list_collections(request):
     return success(response, pr)
 
 
-@router.get("/default_collections")
-async def list_system_collections(request):
-    pr = await query_collections(settings.ADMIN_USER, build_pq(request))
-    response = []
-    async for collection in pr.data:
-        response.append(collection.view())
-    return success(response, pr)
-
 @router.get("/collections/{collection_id}")
 async def get_collection(request, collection_id):
     user = get_user(request)