docs: add Music Assistant Traefik route (ma.xtrm-lab.org)

HA add-on exposed on port 8095, routed via Traefik dynamic config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/03-SERVICES-OTHER.md

@@ -355,6 +355,15 @@ Non-critical services that enhance functionality but don't affect core network o
 **Purpose:** Local speech-to-text and text-to-speech for Home Assistant Assist (Wyoming protocol, plain TCP, no Traefik)
 **Stack:** `wyoming` (Dockge), data in `/mnt/user/appdata/wyoming/`. Added 2026-10-10.
 
+### Music Assistant
+
+| URL | Backend |
+|-----|---------|
+| https://ma.xtrm-lab.org | 192.168.10.102:8095 |
+
+**Purpose:** Music library aggregation and playback control (Spotify, local media). HA add-on (`d5369777-music-assistant`), exposed via Traefik.
+**Players:** Samsung Q-Series soundbar, LG TV, EON Smart Box. Added 2026-10-10; Traefik route added 2026-10-17.
+
 ### Home Assistant Time Machine
 
 | Component | Port |