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.

Dockerfile

@@ -24,10 +24,10 @@ ENV PYTHONUNBUFFERED=1
 # Fix SSL cert path for the slim base image (ca-certificates installs to /etc/ssl/certs)
 ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
 
-# Install LiveKit server binary + supervisord + nginx + ffmpeg (yt-dlp audio
-# extraction/transcoding for the media player)
+# Install LiveKit server runtime dependencies, supervisord, and nginx.
+# Music download/transcode dependencies live in hope-media-music now.
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl ca-certificates supervisor nginx libasound2 iproute2 ffmpeg \
+    curl ca-certificates supervisor nginx libasound2 iproute2 \
     && rm -rf /var/lib/apt/lists/*
 
 # Download LiveKit server (latest stable)
@@ -52,7 +52,7 @@ COPY agent/task_worker.py /opt/voice-agent/task_worker.py
 COPY agent/dispatch_mcp.py /opt/voice-agent/dispatch_mcp.py
 COPY agent/media_mcp.py /opt/voice-agent/media_mcp.py
 
-# Copy web frontend + token endpoint + media server
+# Copy the voice frontend + token endpoint. Hope Music is a separate service.
 COPY web/index.html /var/www/voice/
 COPY web/app.js /var/www/voice/
 COPY web/style.css /var/www/voice/
@@ -60,10 +60,6 @@ COPY web/livekit-client.umd.js /var/www/voice/
 COPY web/manifest.json /var/www/voice/
 COPY web/favicon.svg /var/www/voice/
 COPY web/token_server.py /opt/voice/token_server.py
-COPY web/media_server.py /opt/voice/media_server.py
-
-# Permanent media library mount point (bind-mounted from ./media)
-RUN mkdir -p /data/media/files /data/media/thumbs /data/media/jobs
 
 # Config files
 COPY livekit.yaml /etc/livekit.yaml