fix(voice): screen share releases audio connection so Streamer owns voice session

The dank074 Streamer creates its own WebRTC voice connection, but Discord
allows only ONE voice session per user. When VoiceController (audio) was
already connected, the Streamer join hung forever (never got
VOICE_SERVER_UPDATE). Now:

1. ScreenShareController takes releaseVoice/restoreVoice callbacks.
2. Before joining, it disconnects the @discordjs audio connection via
   VoiceController.disconnectGuild.
3. Streamer joins + streams GoLive.
4. After the stream ends, restoreVoice reconnects the audio connection so
   mic/listen keep working.
5. media.handler wires these via a new setVoiceController accessor from
   commandHandler; VoiceController is the single source of truth.

Also adds caller-bound timeouts & safe .catch() everywhere so a stream
failure can never become an unhandledRejection again.

services/discord-gateway/src/modules/command-handler/commandHandler.ts

@@ -86,6 +86,9 @@ export class CommandHandler {
     this.mediaHandler = new MediaHandler(client, () =>
       voiceController.getStatus(),
     );
+    // Give media handler access to disconnect/reconnect voice around screen
+    // share (GoLive needs its own WebRTC connection).
+    this.mediaHandler.setVoiceController(() => voiceController);
     this.guildHandler = new GuildHandler(client);
     this.moderationHandler = new ModerationHandler(client);