fix: disable auto-retry and improve error messages in Agrarmonitor

- Set autoRetry: false and timeoutMs: 10000 in AgrarmonitorService
- Show specific error message on timeout or backend error in frontend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

paperless-backend/src/agrarmonitor/agrarmonitor.service.ts

@@ -48,7 +48,8 @@ export class AgrarmonitorService {
       password,
       cookieStore,
       autoLogin: true,
-      autoRetry: true,
+      autoRetry: false,
+      timeoutMs: 10000,
       logger: this.logger,
     });
 

paperless-frontend/src/pages/SettingsPage.tsx

@@ -2239,8 +2239,11 @@ function AgrarmonitorTab() {
     try {
       const data = await agrarmonitorApi.getStatus();
       setStatus(data);
-    } catch {
+    } catch (err: any) {
-      setStatus({ connected: false, registriert: null, freigeschaltet: null, error: 'Netzwerkfehler' });
+      const msg = err?.code === 'ECONNABORTED'
+        ? 'Timeout – Backend antwortet nicht rechtzeitig'
+        : (err?.response?.data?.message ?? err?.message ?? 'Netzwerkfehler');
+      setStatus({ connected: false, registriert: null, freigeschaltet: null, error: msg });
     } finally {
       setLoading(false);
     }