fix fb issue

app/facebook.py

@@ -104,7 +104,7 @@ class FacebookClient:
         Gửi tin nhắn sử dụng facebook-sdk với request method trực tiếp.
         """
         try:
-            graph = facebook.GraphAPI(access_token=page_access_token, version="2.0")
+            graph = facebook.GraphAPI(access_token=page_access_token, version="3.1")
             
             # Sử dụng request method trực tiếp cho Messenger API
             result = graph.request(
@@ -122,6 +122,21 @@ class FacebookClient:
             logger.error(f"Unexpected error sending message to Facebook: {e}")
             raise HTTPException(status_code=500, detail="Failed to send message to Facebook")
 
+    def _get_page_info_sync(self, page_access_token: str, page_id: str) -> dict:
+        """
+        Lấy thông tin page sử dụng Facebook SDK.
+        """
+        try:
+            graph = facebook.GraphAPI(access_token=page_access_token, version="3.1")
+            result = graph.get_object(page_id)
+            return result
+        except facebook.GraphAPIError as e:
+            logger.error(f"Facebook GraphAPI Error getting page info: {e}")
+            raise HTTPException(status_code=500, detail=f"Failed to get page info: {e}")
+        except Exception as e:
+            logger.error(f"Unexpected error getting page info: {e}")
+            raise HTTPException(status_code=500, detail="Failed to get page info")
+
     @timing_decorator_async
     async def send_message(self, page_access_token: Optional[str] = None, recipient_id: Optional[str] = None, message: str = "") -> dict:
         page_access_token = page_access_token or self.page_token
@@ -140,7 +155,7 @@ class FacebookClient:
             if len(msg) > 2000:
                 msg = msg[:2000]  # fallback cắt cứng
             
-            # Wrap sync SDK call in thread executor để giữ async
+            # Wrap sync HTTP call in thread executor để giữ async
             loop = asyncio.get_event_loop()
             result = await loop.run_in_executor(
                 None, 
@@ -153,6 +168,25 @@ class FacebookClient:
         
         return results[0] if results else {}
 
+    @timing_decorator_async
+    async def get_page_info(self, page_access_token: Optional[str] = None, page_id: Optional[str] = None) -> dict:
+        """
+        Lấy thông tin page sử dụng Facebook SDK (async).
+        """
+        page_access_token = page_access_token or self.page_token
+        page_id = page_id or self.page_id
+        if not page_access_token or not page_id:
+            raise ValueError("FacebookClient: page_access_token and page_id must not be None when getting page info.")
+        
+        loop = asyncio.get_event_loop()
+        result = await loop.run_in_executor(
+            None,
+            self._get_page_info_sync,
+            page_access_token,
+            page_id
+        )
+        return result
+
     @timing_decorator_sync
     def parse_message(self, body: Dict[str, Any]) -> Optional[Dict[str, Any]]:
         """