Refa: align chat and search restful APIs (#14229)

### What problem does this PR solve?

Refactor /api/v1/chats to be more RESTful.

### Type of change

- [x] Refactoring

---------

Co-authored-by: Jin Hai <haijin.chn@gmail.com>

sdk/python/ragflow_sdk/modules/session.py

@@ -115,8 +115,8 @@ class Session(Base):
         return res
 
     def update(self, update_message):
-        res = self.put(f"/chats/{self.chat_id}/sessions/{self.id}",
-                       update_message)
+        res = self.patch(f"/chats/{self.chat_id}/sessions/{self.id}",
+                         update_message)
         res = res.json()
         if res.get("code") != 0:
             raise Exception(res.get("message"))