feat(sources): Review-Queue-UI fuer LLM-Klassifikations-Vorschlaege (Admin)

- Tab-Schalter im Quellen-Modal: "Quellenliste" vs. "Klassifikations-Review"
  (Review-Tab nur fuer org_admin sichtbar, mit Pending-Counter-Badge).
- Review-Karten zeigen Diff aktueller Wert -> LLM-Vorschlag pro Achse,
  Konfidenz-Indikator (gruen/gelb/rot), LLM-Begruendung, Buttons fuer
  Uebernehmen / Verwerfen / Neu klassifizieren.
- Toolbar: Konfidenz-Filter, "Klassifikation starten" (Bulk im Hintergrund),
  "Alle >= 0.85 genehmigen" (Bulk-Approve).
- API-Wrapper in api.js fuer alle 6 neuen Endpoints + erweiterte listSources-Filter.
- Backend-Endpoint POST /api/sources/classification/bulk-approve (Admin-only).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/static/js/components.js

@@ -1119,6 +1119,71 @@ const UI = {
         sonstige: 'sonstige',
     },
 
+    /**
+     * Eintrag in der Klassifikations-Review-Queue.
+     * Zeigt Diff zwischen aktuellem Wert und LLM-Vorschlag.
+     */
+    renderClassificationQueueItem(item) {
+        const cur = item.current || {};
+        const prop = item.proposed || {};
+        const conf = prop.confidence || 0;
+        const confPct = Math.round(conf * 100);
+        const confClass = conf >= 0.85 ? 'high' : (conf >= 0.7 ? 'medium' : 'low');
+
+        const diffRow = (label, currentVal, proposedVal, formatter) => {
+            const fmt = formatter || (v => v == null || v === '' ? '–' : String(v));
+            const c = fmt(currentVal);
+            const p = fmt(proposedVal);
+            const changed = c !== p;
+            return `<div class="review-diff-row${changed ? ' changed' : ''}">
+                <span class="review-diff-label">${this.escape(label)}</span>
+                <span class="review-diff-current">${this.escape(c)}</span>
+                <span class="review-diff-arrow">→</span>
+                <span class="review-diff-proposed">${this.escape(p)}</span>
+            </div>`;
+        };
+
+        const polFmt = v => (v && v !== 'na') ? (this._politicalLabels[v]?.full || v) : '–';
+        const mtFmt = v => (v && v !== 'sonstige') ? (this._mediaTypeLabels[v] || v) : (v === 'sonstige' ? 'Sonstige' : '–');
+        const relFmt = v => (v && v !== 'na') ? (this._reliabilityLabels[v] || v) : '–';
+        const stateFmt = v => v ? 'ja' : 'nein';
+        const ccFmt = v => v || '–';
+        const alignFmt = v => (Array.isArray(v) && v.length > 0)
+            ? v.map(a => this._alignmentLabels[a] || a).join(', ')
+            : '–';
+
+        const globalBadge = item.is_global ? '<span class="review-global-badge">Grundquelle</span>' : '';
+        const reasoning = prop.reasoning ? this.escape(prop.reasoning) : '';
+
+        return `<div class="review-card" data-source-id="${item.id}">
+            <div class="review-card-header">
+                <div class="review-card-title">
+                    <span class="review-card-name">${this.escape(item.name)}</span>
+                    ${globalBadge}
+                    <span class="review-card-domain">${this.escape(item.domain || '')}</span>
+                </div>
+                <div class="review-card-confidence conf-${confClass}" title="LLM-Konfidenz">
+                    <span class="conf-value">${confPct}%</span>
+                    <span class="conf-label">Konfidenz</span>
+                </div>
+            </div>
+            <div class="review-card-diff">
+                ${diffRow('Politik', cur.political_orientation, prop.political_orientation, polFmt)}
+                ${diffRow('Medientyp', cur.media_type, prop.media_type, mtFmt)}
+                ${diffRow('Glaubwürdigkeit', cur.reliability, prop.reliability, relFmt)}
+                ${diffRow('Staatsnah', cur.state_affiliated, prop.state_affiliated, stateFmt)}
+                ${diffRow('Land', cur.country_code, prop.country_code, ccFmt)}
+                ${diffRow('Geopol. Nähe', cur.alignments, prop.alignments, alignFmt)}
+            </div>
+            ${reasoning ? `<div class="review-card-reasoning"><strong>Begründung:</strong> ${reasoning}</div>` : ''}
+            <div class="review-card-actions">
+                <button class="btn btn-small btn-primary" onclick="App.approveClassification(${item.id})">Übernehmen</button>
+                <button class="btn btn-small btn-secondary" onclick="App.rejectClassification(${item.id})">Verwerfen</button>
+                <button class="btn btn-small btn-secondary" data-reclassify-id="${item.id}" onclick="App.reclassifySource(${item.id})">Neu klassifizieren</button>
+            </div>
+        </div>`;
+    },
+
     _renderClassificationBadges(feed) {
         const parts = [];
         const pol = feed.political_orientation;