feat: add voice recordings feature with database integration

- Implemented PostgreSQL and SQLite schemas for voice recordings.
- Created repository functions for inserting, updating, and listing voice recordings.
- Developed uploader logic to handle file uploads and database updates.
- Added routes for accessing voice recordings via API.
- Enhanced UI state to include recordings tab.
- Introduced moderation WebSocket event for uploaded recordings.

frontend/src/hooks/useDashboardSocket.ts

@@ -15,6 +15,7 @@ export interface DashboardSocketHandlers {
   onMessageAnalyzed?: (message: MessageRecord) => void;
   onAttachmentUploaded?: () => void;
   onMediaState?: (state: MediaState) => void;
+  onVoiceRecordingUploaded?: (recording: any) => void;
   onPcm?: (data: ArrayBuffer) => void;
 }
 
@@ -75,6 +76,9 @@ export function useDashboardSocket(handlers: DashboardSocketHandlers) {
             case "media_state":
               handlersRef.current.onMediaState?.(message.state);
               break;
+            case "voice_recording_uploaded":
+              handlersRef.current.onVoiceRecordingUploaded?.(message.data);
+              break;
           }
         } catch {
           // ignore malformed socket messages