feat(system): implement graceful shutdown and expand websocket events

Improve system reliability and real-time capabilities by implementing a robust lifecycle management system and adding new broadcast events for attachments and voice recordings.

- Implement asynchronous graceful shutdown in backend to close HTTP, WebSocket, Redis, and database connections.
- Add new WebSocket broadcast events: `attachment_created`, `voice_recording_started`, `voice_recording_stopped`, `voice_recording_uploaded`, and `analysis_queue_status`.
- Refactor media status handling to use boolean `playing` state instead of string-based status.
- Centralize `PageResult` and `VoiceRecording` types to improve consistency between frontend and backend.
- Update frontend API client to include `listRecordings` and handle new WebSocket event types.
- Fix type mismatches in voice command handling and media status reporting.

services/backend/src/ws/broadcast.ts

@@ -18,9 +18,14 @@ export interface BroadcastFunctions {
   messageUpdated: BroadcastFn;
   messageDeleted: BroadcastFn;
   messageAnalyzed: BroadcastFn;
+  attachmentCreated: BroadcastFn;
   attachmentUploaded: BroadcastFn;
+  voiceRecordingStarted: BroadcastFn;
+  voiceRecordingStopped: BroadcastFn;
+  voiceRecordingUploaded: BroadcastFn;
   voicePcmData: BroadcastFn;
   voiceActiveUser: BroadcastFn;
+  analysisQueueStatus: BroadcastFn;
   raw: BroadcastRawFn;
   binary: BroadcastBinaryFn;
 }
@@ -53,18 +58,33 @@ export const broadcastMessageUpdated: BroadcastFn = (data) =>
 export const broadcastMessageDeleted: BroadcastFn = (data) =>
   (_fns?.messageDeleted ?? noop)(data);
 
+export const broadcastAttachmentCreated: BroadcastFn = (data) =>
+  (_fns?.attachmentCreated ?? noop)(data);
+
 export const broadcastAttachmentUploaded: BroadcastFn = (data) =>
   (_fns?.attachmentUploaded ?? noop)(data);
 
 export const broadcastMessageAnalyzed: BroadcastFn = (data) =>
   (_fns?.messageAnalyzed ?? noop)(data);
 
+export const broadcastVoiceRecordingStarted: BroadcastFn = (data) =>
+  (_fns?.voiceRecordingStarted ?? noop)(data);
+
+export const broadcastVoiceRecordingStopped: BroadcastFn = (data) =>
+  (_fns?.voiceRecordingStopped ?? noop)(data);
+
+export const broadcastVoiceRecordingUploaded: BroadcastFn = (data) =>
+  (_fns?.voiceRecordingUploaded ?? noop)(data);
+
 export const broadcastVoicePcmData: BroadcastFn = (data) =>
   (_fns?.voicePcmData ?? noop)(data);
 
 export const broadcastVoiceActiveUser: BroadcastFn = (data) =>
   (_fns?.voiceActiveUser ?? noop)(data);
 
+export const broadcastAnalysisQueueStatus: BroadcastFn = (data) =>
+  (_fns?.analysisQueueStatus ?? noop)(data);
+
 export const broadcastRaw: BroadcastRawFn = (type, data) =>
   (_fns?.raw ?? noopRaw)(type, data);