refactor: remove voice, recording, and music/media features (gateway + backend)

- Gateway: delete voice-recording/, voice-pcm-ws/, voice/video/media handlers,
  vendor/discord-voice-fork/, voice DB repos, 2 voice migrations
- Gateway: cut voice wiring from bootstrap/shutdown/commandHandler/handler-registry,
  eventBroadcaster/eventTypes, redis-channels, moderation-types, message-capture,
  config keys, and deps (@discordjs/voice, opus, libsodium, prism-media, davey)
- Backend: delete voice/, recordings/, media/ modules + @discordjs/voice dep
- Backend: cut voice/media/recordings oRPC routers, WS gateway-PCM auth + voice
  handlers, Redis bridge voice aggregation, redis-channels voice/media constants,
  config keys, moderation-types voice items, e2e voice/recordings suites
- Keep voice DB tables (destructive migration avoided); chatbot voiceRecordings
  tool + dashboard count remain as read-only historical data access

services/discord-gateway/src/app/shutdown.ts

@@ -3,9 +3,6 @@ import type { createChildLogger } from "@/shared/logger/index";
 import type { CommandHandler } from "../modules/command-handler/commandHandler.js";
 import type { EventBroadcaster } from "../modules/event-broadcaster/index.js";
 import type { stopMetricsServer } from "../modules/gateway-metrics/index.js";
-import type { VoicePcmWsClient } from "../modules/voice-pcm-ws/index.js";
-import { stopMuxerWorker } from "../modules/voice-recording/muxer.js";
-import type { VoiceController } from "../modules/voice-recording/voiceController.js";
 import type { closeDatabase } from "../shared/database/drizzle.js";
 
 type Logger = ReturnType<typeof createChildLogger>;
@@ -15,12 +12,10 @@ type StopMetricsServer = typeof stopMetricsServer;
 export interface GracefulShutdownOptions {
   logger: Logger;
   closeDatabase: CloseDatabase;
-  voiceController: VoiceController;
   client: Client;
   eventBroadcaster: EventBroadcaster;
   commandHandler: CommandHandler;
   stopMetricsServer?: StopMetricsServer;
-  pcmWsClient?: VoicePcmWsClient;
 }
 
 export function createGracefulShutdown(options: GracefulShutdownOptions) {
@@ -37,26 +32,15 @@ export function createGracefulShutdown(options: GracefulShutdownOptions) {
 
     try {
       options.stopMetricsServer?.();
-      stopMuxerWorker();
 
-      // 1. Voice disconnect (may write final DB records)
-      options.logger.info("Stopping voice connection...");
-      await options.voiceController.disconnect();
-
-      // 1b. Close PCM WebSocket client (after voice, before Redis)
-      if (options.pcmWsClient) {
-        options.logger.info("Closing voice PCM WS client...");
-        await options.pcmWsClient.close();
-      }
-
-      // 2. Close Redis/pubsub after voice is done
+      // 1. Close Redis/pubsub
       options.logger.info("Closing event broadcaster...");
       await options.eventBroadcaster.close();
 
       options.logger.info("Closing command handler...");
       await options.commandHandler.close();
 
-      // 3. DB pool LAST – voice disconnect may finalize recordings
+      // 2. DB pool
       options.logger.info("Closing database...");
       await options.closeDatabase();
       options.logger.info("Database closed");