feat: runtime config, Matomo analytics, chat accounts, DM history/search, and Prometheus retention

.env.example

@@ -57,6 +57,11 @@ PLAYLIST_PATH=/app/playlist/playlist.txt
 HLS_SEGMENT_DURATION=6
 HLS_WINDOW_SIZE=24
 
+# Shared runtime config (written by chat admin via /api/admin/config, read by playout).
+# Both resolve to the same host file through the ./data/playlist volume.
+CONFIG_PATH=/app/playlist/config.json
+PLAYOUT_CONFIG_PATH=/app/playlist/config.json
+
 # Logging / Monitoring
 LOG_LEVEL=info
 PROMETHEUS_PORT=9090