refactor: split music streaming into Hope Music

Move the media server, downloader, library volume, and browser player to the
standalone hope-media-music product. Keep Hope's music tools as a thin HTTP
client of the LAN service on port 8094.

Use a stable voice-room player scope instead of ephemeral LiveKit room names.
The agent now owns the conversation handshake: fresh reported playback mutes
its input, joining pauses music, and the last participant leaving resumes only
music it paused. Peer failures remain non-fatal.

Also move the voice deploy workflow onto the active Unraid Gitea runner and
remove yt-dlp/ffmpeg/media health and volume dependencies from the image.

agent/voice_agent.egg-info/PKG-INFO

@@ -10,4 +10,3 @@ Requires-Dist: livekit-plugins-azure~=1.7
 Requires-Dist: livekit-plugins-openai~=1.7
 Requires-Dist: python-dotenv
 Requires-Dist: uvicorn>=0.52.4
-Requires-Dist: yt-dlp>=2026.8.19

agent/voice_agent.egg-info/requires.txt

@@ -5,4 +5,3 @@ livekit-plugins-azure~=1.7
 livekit-plugins-openai~=1.7
 python-dotenv
 uvicorn>=0.52.4
-yt-dlp>=2026.8.19