Revert "Refa: Chats /chat API to RESTFul (#13871)" (#13877)

### What problem does this PR solve?

This reverts commit 1a608ac411.

### Type of change

- [x] Other (please describe):

sdk/python/ragflow_sdk/modules/base.py

@@ -54,9 +54,5 @@ class Base:
         res = self.rag.put(path, json)
         return res
 
-    def patch(self, path, json):
-        res = self.rag.patch(path, json)
-        return res
-
     def __str__(self):
         return str(self.to_json())