fix token error

app/supabase_db.py

@@ -21,7 +21,7 @@ class SupabaseClient:
         Output: access_token (str) hoặc None nếu không có.
         """
         try:
-            response = self.client.table('PageTokens').select('token').eq('id', page_id).execute()
+            response = self.client.table('PageToken').select('token').eq('id', page_id).execute()
             if response.data and len(response.data) > 0:
                 return response.data[0]['token']
             return None