Multiplayer mode: server, room tokens, docker setup, and client UI

docker-compose.yml

@@ -0,0 +1,10 @@
+services:
+  ttt:
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      - BASE_PATH=/game
+    volumes:
+      - ./server/data:/app/server/data
+    restart: unless-stopped