Add docker setup and switch voice chat backend to use livekit

server/config.docker.toml

@@ -0,0 +1,9 @@
+# Docker runtime config — TLS terminated by the reverse proxy (Caddy/nginx).
+# Do not use this file outside of the Docker container.
+
+[server]
+bind_ip = "0.0.0.0"
+port = 4474
+
+[network]
+allow_insecure_ws = true