fix(voice): self-undeafen/self-unmute bot instantly on server mute/deafen

Previously forceSelfServerUnmuteUndeafen only ran on video-watch attempts and
after voice reconnects — so when an admin server-muted or server-deafened the
bot, it stayed muted/deafened for minutes (or forever if no streamer came on).

Add registerSelfVoiceStateGuard: a voiceStateUpdate listener that detects the
bot's own serverMute/serverDeaf transition to true and immediately re-issues
mute:false,deaf:false. Wired at client-ready in bootstrap.ts. Best-effort,
idempotent, never blocks the gateway.

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

@@ -36,6 +36,7 @@ import { registerPresenceCapture } from "../modules/user-presence/index.js";
 import { VoicePcmWsClient } from "../modules/voice-pcm-ws/index.js";
 import { startMuxerWorker } from "../modules/voice-recording/muxer.js";
 import {
+  registerSelfVoiceStateGuard,
   setPcmWsClient,
   setEventBroadcaster as setRecorderEventBroadcaster,
 } from "../modules/voice-recording/recorder.js";
@@ -298,6 +299,12 @@ export async function initializeDiscordGateway() {
         ),
       );
 
+    // Attach the immediate self-undeafen/self-unmute guard so the bot reacts
+    // INSTANTLY when an admin server-mutes or server-deafens it (previously
+    // only re-asserted on video-watch/reconnect, leaving the bot muted for
+    // minutes).
+    registerSelfVoiceStateGuard(client);
+
     // Start retention cleanup scheduler
     startRetentionCleanup();
     // Start weekly moderation digest (public, automated)