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/retention.ts

@@ -4,11 +4,7 @@ import { createChildLogger } from "@/shared/logger/index";
 import { config } from "../shared/config/config.js";
 import { getDatabase } from "../shared/database/drizzle.js";
 import type * as schema from "../shared/database/schema.js";
-import {
-  attachmentsTable,
-  messagesTable,
-  voiceRecordingsTable,
-} from "../shared/database/schema.js";
+import { attachmentsTable, messagesTable } from "../shared/database/schema.js";
 
 const logger = createChildLogger("discord-gateway");
 
@@ -73,7 +69,6 @@ function startRetentionCleanup(): void {
       dryRun,
       messagesDays: config.RETENTION_MESSAGES_DAYS,
       attachmentsDays: config.RETENTION_ATTACHMENTS_DAYS,
-      voiceDays: config.RETENTION_VOICE_DAYS,
     },
     "Starting retention cleanup scheduler",
   );
@@ -93,13 +88,6 @@ function startRetentionCleanup(): void {
       dryRun,
       "attachments",
     );
-    await deleteExpiredRecords(
-      voiceRecordingsTable,
-      voiceRecordingsTable.created_at,
-      config.RETENTION_VOICE_DAYS,
-      dryRun,
-      "voice recordings",
-    );
   }
 
   // Run immediately on start, then schedule