Add docker setup and switch voice chat backend to use livekit

livekit.example.yaml

@@ -0,0 +1,19 @@
+# LiveKit server configuration for self-hosted Docker deployment.
+# See https://docs.livekit.io/realtime/self-hosting/deployment/ for all options.
+#
+# Copy this file to livekit.yaml and set matching keys in your .env file.
+
+port: 7880
+rtc:
+  port_range_start: 50000
+  port_range_end: 60000
+  tcp_port: 7881
+  udp_port: 7882
+  # Use the host's external IP for ICE candidates so browsers can reach the server.
+  use_external_ip: true
+
+keys:
+  your-api-key: your-api-secret
+
+logging:
+  level: info