Wording: Domain sperren → Domain ausschließen

Einheitliche Umbenennung in UI-Texten, Kommentaren und Docstrings:
- Sperren → Ausschließen
- Gesperrt → Ausgeschlossen
- Entsperren → Ausschluss aufheben

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

src/static/dashboard.html

@@ -427,7 +427,7 @@
                             <option value="">Alle Typen</option>
                             <option value="rss_feed">RSS-Feed</option>
                             <option value="web_source">Web-Quelle</option>
-                            <option value="excluded">Gesperrt</option>
+                            <option value="excluded">Ausgeschlossen</option>
                         </select>
                         <label for="sources-filter-category" class="sr-only">Kategorie filtern</label>
                         <select id="sources-filter-category" class="timeline-filter-select" onchange="App.filterSources()">
@@ -447,12 +447,12 @@
                         <input type="text" id="sources-search" class="timeline-filter-input sources-search-input" placeholder="Suche..." oninput="App.filterSources()">
                     </div>
                     <div class="sources-toolbar-actions">
-                        <button class="btn btn-secondary btn-small source-block-btn" onclick="App.showBlockDomainDialog()">Domain sperren</button>
+                        <button class="btn btn-secondary btn-small source-block-btn" onclick="App.showBlockDomainDialog()">Domain ausschließen</button>
                         <button class="btn btn-primary btn-small" onclick="App.toggleSourceForm()">+ Quelle</button>
                     </div>
                 </div>
 
-                <!-- Inline-Formular: Domain sperren (ein-/ausklappbar) -->
+                <!-- Inline-Formular: Domain ausschließen (ein-/ausklappbar) -->
                 <div class="sources-add-form" id="sources-block-form" style="display:none;">
                     <div class="sources-form-row">
                         <div class="form-group flex-1">
@@ -463,7 +463,7 @@
                             <label for="block-domain-notes">Notizen</label>
                             <input type="text" id="block-domain-notes" class="source-notes-input" placeholder="Optional">
                         </div>
-                        <button class="btn btn-danger btn-small" onclick="App.blockDomain()">Sperren</button>
+                        <button class="btn btn-danger btn-small" onclick="App.blockDomain()">Ausschließen</button>
                         <button class="btn btn-secondary btn-small" onclick="App.showBlockDomainDialog(false)">Abbrechen</button>
                     </div>
                 </div>