feat: Complete Stage 2 frontend refactor

- Removed deprecated fields from Content and Task models, including entity_type, sync_status, and cluster_role.
- Updated Content model to include new fields: content_type, content_structure, taxonomy_terms, source, external_id, and cluster_id.
- Refactored Writer module components (Content, ContentView, Dashboard, Tasks) to align with new schema.
- Enhanced Dashboard metrics and removed unused filters.
- Implemented ClusterDetail page to display cluster information and associated content.
- Updated API service interfaces to reflect changes in data structure.
- Adjusted sorting and filtering logic across various components to accommodate new field names and types.
- Improved user experience by providing loading states and error handling in data fetching.

frontend/src/pages/Optimizer/AnalysisPreview.tsx

@@ -111,9 +111,8 @@ export default function AnalysisPreview() {
                 {content.title || 'Untitled'}
               </h2>
               <p className="text-sm text-gray-600 dark:text-gray-400">
-                Word Count: {content.word_count || 0} | 
                 Source: {content.source} | 
-                Status: {content.sync_status}
+                Status: {content.status}
               </p>
             </div>
 
@@ -263,7 +262,7 @@ export default function AnalysisPreview() {
                       </div>
                     </div>
                   )}
-                  {!scores.has_attributes && (content?.entity_type === 'product' || content?.entity_type === 'service') && (
+                  {!scores.has_attributes && (content?.content_type === 'product' || content?.content_type === 'service') && (
                     <div className="p-3 bg-orange-50 dark:bg-orange-900/20 border border-orange-200 dark:border-orange-800 rounded-lg">
                       <div className="flex items-start gap-2">
                         <span className="text-orange-600 dark:text-orange-400 font-bold">3.</span>

frontend/src/pages/Optimizer/ContentSelector.tsx

@@ -8,7 +8,6 @@ import { optimizerApi, EntryPoint } from '../../api/optimizer.api';
 import { fetchContent, Content as ContentType } from '../../services/api';
 import { useToast } from '../../components/ui/toast/ToastContainer';
 import { SourceBadge, ContentSource } from '../../components/content/SourceBadge';
-import { SyncStatusBadge, SyncStatus } from '../../components/content/SyncStatusBadge';
 import { ContentFilter, FilterState } from '../../components/content/ContentFilter';
 import { OptimizationScores } from '../../components/optimizer/OptimizationScores';
 import { BoltIcon, CheckCircleIcon, FileIcon } from '../../icons';
@@ -28,7 +27,6 @@ export default function OptimizerContentSelector() {
   const [selectedIds, setSelectedIds] = useState<number[]>([]);
   const [filters, setFilters] = useState<FilterState>({
     source: 'all',
-    syncStatus: 'all',
     search: '',
   });
   const [entryPoint, setEntryPoint] = useState<EntryPoint>('auto');
@@ -77,11 +75,6 @@ export default function OptimizerContentSelector() {
       filtered = filtered.filter(item => item.source === filters.source);
     }
 
-    // Sync status filter
-    if (filters.syncStatus !== 'all') {
-      filtered = filtered.filter(item => item.sync_status === filters.syncStatus);
-    }
-
     setFilteredContent(filtered);
   }, [content, filters]);
 
@@ -223,9 +216,6 @@ export default function OptimizerContentSelector() {
                     <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wider">
                       Source
                     </th>
-                    <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wider">
-                      Status
-                    </th>
                     <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wider">
                       Score
                     </th>
@@ -264,9 +254,6 @@ export default function OptimizerContentSelector() {
                         <td className="px-6 py-4 whitespace-nowrap">
                           <SourceBadge source={(item.source as ContentSource) || 'igny8'} />
                         </td>
-                        <td className="px-6 py-4 whitespace-nowrap">
-                          <SyncStatusBadge status={(item.sync_status as SyncStatus) || 'native'} />
-                        </td>
                         <td className="px-6 py-4 whitespace-nowrap">
                           {scores?.overall_score ? (
                             <span className="text-sm font-medium text-gray-900 dark:text-white">