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/Linker/ContentList.tsx

@@ -159,11 +159,6 @@ export default function LinkerContentList() {
                           {item.cluster_name ? (
                             <span className="inline-flex items-center px-2 py-1 rounded-full text-xs font-medium bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200">
                               {item.cluster_name}
-                              {item.cluster_role && (
-                                <span className="ml-1 text-blue-600 dark:text-blue-400">
-                                  ({item.cluster_role})
-                                </span>
-                              )}
                             </span>
                           ) : (
                             <span className="text-gray-400 dark:text-gray-500">-</span>