feat(frontend): Webhook-Status-Tab in den Einstellungen

Neuer Tab "Webhook" in der SettingsPage zeigt den letzten Paperless-
Webhook-Aufruf (Zeitpunkt, Dokument-ID, Aktion, Ergebnis) über
GET /api/webhook/status an. Neue API-Datei src/api/webhook.ts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

paperless-frontend/src/api/webhook.ts

@@ -0,0 +1,19 @@
+import api from './client';
+
+export interface WebhookLastCall {
+  at: string; // ISO-Zeitstempel
+  documentId: number | null;
+  action: string | null;
+  status: 'processed' | 'skipped' | 'error' | 'bad-request' | string;
+  reason?: string;
+  message?: string;
+}
+
+export interface WebhookStatus {
+  lastCall: WebhookLastCall | null;
+}
+
+export const webhookApi = {
+  getStatus: () =>
+    api.get<WebhookStatus>('/api/webhook/status').then((r) => r.data),
+};

paperless-frontend/src/pages/SettingsPage.tsx

@@ -2,14 +2,14 @@ import { useEffect, useState, useCallback } from 'react';
 import dayjs from 'dayjs';
 import {
   Tabs, Typography, Table, Button, Modal, Form, Input, Select,
-  Switch, Checkbox, Popconfirm, message, Card, Tag, Space, Divider, InputNumber, Badge, Row, Col, Radio, Alert,
+  Switch, Checkbox, Popconfirm, message, Card, Tag, Space, Divider, InputNumber, Badge, Row, Col, Radio, Alert, Descriptions,
 } from 'antd';
 import {
   UserOutlined, FileTextOutlined, ThunderboltOutlined,
   PlusOutlined, DeleteOutlined, EditOutlined, CloudUploadOutlined,
   HistoryOutlined, MinusCircleOutlined, CopyOutlined, KeyOutlined,
   QrcodeOutlined, UnorderedListOutlined, PrinterOutlined, GlobalOutlined,
-  TagsOutlined,
+  TagsOutlined, ApiOutlined, ReloadOutlined,
 } from '@ant-design/icons';
 import type { ColumnsType } from 'antd/es/table';
 import type { FormInstance } from 'antd';
@@ -26,6 +26,7 @@ import {
 } from '../api/settings';
 import { clientsApi, type Client } from '../api/inbox';
 import { apiKeysApi, type ApiKey } from '../api/api-keys';
+import { webhookApi, type WebhookStatus } from '../api/webhook';
 import {
   barcodeTemplatesApi,
   type BarcodeTemplate,
@@ -2748,6 +2749,91 @@ function SteuertagsTab() {
 // Settings Page
 // ═══════════════════════════════════════════════════════════════════
 
+// ═══════════════════════════════════════════════════════════════════
+// Webhook-Status Tab
+// ═══════════════════════════════════════════════════════════════════
+
+function WebhookStatusTab() {
+  const [status, setStatus] = useState<WebhookStatus | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  const load = useCallback(async () => {
+    setLoading(true);
+    try {
+      const data = await webhookApi.getStatus();
+      setStatus(data);
+    } catch (err) {
+      console.error('Error loading webhook status:', err);
+      message.error('Webhook-Status konnte nicht geladen werden');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => { load(); }, [load]);
+
+  const renderStatusBadge = (s: string) => {
+    switch (s) {
+      case 'processed': return <Badge status="success" text="Verarbeitet" />;
+      case 'skipped': return <Badge status="warning" text="Übersprungen" />;
+      case 'error': return <Badge status="error" text="Fehler" />;
+      case 'bad-request': return <Badge status="error" text="Ungültige Anfrage" />;
+      default: return <Badge status="default" text={s} />;
+    }
+  };
+
+  const lastCall = status?.lastCall ?? null;
+
+  return (
+    <>
+      <div style={{ marginBottom: 16 }}>
+        <Title level={4}>Webhook-Status</Title>
+        <Typography.Paragraph type="secondary">
+          Paperless-NGX ruft nach dem Bearbeiten eines Dokuments den Webhook{' '}
+          <Typography.Text code>/api/webhook/paperless</Typography.Text> auf
+          (per API-Key authentifiziert). Hier siehst du den zuletzt
+          verarbeiteten Aufruf. Eine vollständige Historie steht in den
+          Backend-Logs.
+        </Typography.Paragraph>
+        <Button icon={<ReloadOutlined />} loading={loading} onClick={load}>
+          Aktualisieren
+        </Button>
+      </div>
+
+      <Card size="small" title="Letzter Webhook-Aufruf" loading={loading}>
+        {lastCall ? (
+          <Descriptions column={1} size="small" bordered>
+            <Descriptions.Item label="Zeitpunkt">
+              {dayjs(lastCall.at).format('DD.MM.YYYY HH:mm:ss')}
+            </Descriptions.Item>
+            <Descriptions.Item label="Dokument-ID">
+              {lastCall.documentId ?? '—'}
+            </Descriptions.Item>
+            <Descriptions.Item label="Aktion">
+              {lastCall.action ? <Tag>{lastCall.action}</Tag> : '—'}
+            </Descriptions.Item>
+            <Descriptions.Item label="Ergebnis">
+              {renderStatusBadge(lastCall.status)}
+              {lastCall.reason ? (
+                <Typography.Text type="secondary"> ({lastCall.reason})</Typography.Text>
+              ) : null}
+            </Descriptions.Item>
+            {lastCall.message ? (
+              <Descriptions.Item label="Meldung">
+                <Typography.Text type="danger">{lastCall.message}</Typography.Text>
+              </Descriptions.Item>
+            ) : null}
+          </Descriptions>
+        ) : (
+          <Typography.Text type="secondary">
+            Noch kein Webhook-Aufruf erfolgt.
+          </Typography.Text>
+        )}
+      </Card>
+    </>
+  );
+}
+
 export default function SettingsPage() {
   return (
     <div>
@@ -2805,6 +2891,11 @@ export default function SettingsPage() {
               label: <span><KeyOutlined /> API-Keys</span>,
               children: <ApiKeysTab />,
             },
+            {
+              key: 'webhook',
+              label: <span><ApiOutlined /> Webhook</span>,
+              children: <WebhookStatusTab />,
+            },
             {
               key: 'agrarmonitor',
               label: <span><GlobalOutlined /> Agrarmonitor</span>,