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/dashboard.html

@@ -456,6 +456,15 @@
                 <!-- Stats-Leiste -->
                 <div class="sources-stats-bar" id="sources-stats-bar"></div>
 
+                <!-- Tabs: Liste vs. Klassifikations-Review -->
+                <div class="sources-tabs" role="tablist">
+                    <button type="button" class="sources-tab active" id="sources-tab-list" role="tab" aria-selected="true" onclick="App.switchSourcesTab('list')">Quellenliste</button>
+                    <button type="button" class="sources-tab" id="sources-tab-review" role="tab" aria-selected="false" onclick="App.switchSourcesTab('review')" style="display:none;">Klassifikations-Review <span id="sources-review-count" class="sources-tab-badge">0</span></button>
+                </div>
+
+                <!-- View: Quellenliste -->
+                <div id="sources-list-view">
+
                 <!-- Toolbar -->
                 <div class="sources-toolbar">
                     <div class="sources-filters">
@@ -706,6 +715,35 @@
                 <div class="sources-list" id="sources-list">
                     <div class="empty-state-text" style="padding:var(--sp-3xl);text-align:center;">Lade Quellen...</div>
                 </div>
+
+                </div>
+                <!-- /sources-list-view -->
+
+                <!-- View: Klassifikations-Review (Admin-only) -->
+                <div id="sources-review-view" style="display:none;">
+                    <div class="review-toolbar">
+                        <div class="review-toolbar-info">
+                            <span><strong id="review-pending-count">0</strong> Vorschlaege ausstehend</span>
+                            <label class="review-conf-filter">
+                                Mindest-Konfidenz:
+                                <select id="review-min-confidence" onchange="App.loadClassificationQueue()">
+                                    <option value="0">alle</option>
+                                    <option value="0.5">0.5+</option>
+                                    <option value="0.7">0.7+</option>
+                                    <option value="0.85">0.85+</option>
+                                    <option value="0.9">0.9+</option>
+                                </select>
+                            </label>
+                        </div>
+                        <div class="review-toolbar-actions">
+                            <button class="btn btn-small btn-secondary" onclick="App.triggerBulkClassify()" title="LLM-Klassifikation fuer noch unklassifizierte Quellen starten">+ Klassifikation starten</button>
+                            <button class="btn btn-small btn-primary" onclick="App.bulkApproveHighConfidence()" title="Alle Vorschlaege ueber dem Konfidenz-Schwellwert genehmigen">Alle &ge; 0.85 genehmigen</button>
+                        </div>
+                    </div>
+                    <div class="review-list" id="sources-review-list">
+                        <div class="empty-state-text" style="padding:var(--sp-3xl);text-align:center;">Lade Review-Queue...</div>
+                    </div>
+                </div>
             </div>
         </div>
     </div>