feat(discord-gateway): implement voice & push improvements

- Voice disconnect broadcast on stopRecording
- Multi-guild voice support (VoiceController Map<guildId>)
- Session finalization + auto-enqueue muxer job
- Recordings API: duration field, channelId/userId filters
- Transmitter Redis connection reuse (shared conn)
- FFmpeg stderr memory cap (4KB limit)
- 10 new Redis event channels + Redis bridge subscriptions
- New DB tables: message_reactions, message_edits
- Webhook notification module
- Gateway metrics / Prometheus endpoint
- Multi-guild message capture (MONITOR_GUILD_IDS array)
- Thread tracking, presence, channel topic, guild member events
- Edit history snapshot on message update
- Muxer audio post-processing worker

Co-Authored-By: Claude <noreply@anthropic.com>

services/backend/src/modules/dashboard/dashboard.routes.ts

@@ -56,9 +56,7 @@ export function createDashboardRouter(): Router {
       const search =
         typeof req.query.search === "string" ? req.query.search : undefined;
       const guildId =
-        typeof req.query.guild_id === "string"
-          ? req.query.guild_id
-          : undefined;
+        typeof req.query.guild_id === "string" ? req.query.guild_id : undefined;
 
       const result = await dashboardService.listChannels({
         limit,