Detect expired session only via login page markup

The session check treated any response containing "Anmeldung" or
"Einloggen" as an expired session. Regular content pages (e.g. the FAQ)
mention these words in body text, which triggered a needless re-login and
returned the login page instead of the requested content.

Detection now relies on the status code and isLoginPageText() alone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/AgrarmonitorConnector.ts

@@ -731,9 +731,7 @@ export class AgrarmonitorConnector implements AgrarmonitorConnectorResult {
     return (
       response.status === 401 ||
       response.status === 403 ||
-      this.isLoginPageText(responseText) ||
-      responseText.includes('Anmeldung') ||
-      responseText.includes('Einloggen')
+      this.isLoginPageText(responseText)
     );
   }