add dedicated auth/callback add dashboard auth

utils/callbackmanager.py

@@ -41,7 +41,7 @@ class CallbackManager:
             with open('/tmp/access_token.txt', 'w') as f:
                 f.write(self.access_token)
             return f"Authentication successful! Access Token: {self.access_token[:10]}... (truncated)"
-    return "Authentication failed. Please check the authorization code."
+        return "Authentication failed. Please check the authorization code."    
 
     def get_auth_url(self) -> str:
         return self.api.get_authorization_url()