Initial commit — 2048 terminal game

Plain TS + Vite, JetBrains Mono terminal aesthetic. Includes engine
(pure logic, direction normalization, tile tracking), animated UI
(CSS transitions + keyframes), keyboard/touch input, Dockerfile,
nginx config, docker-compose, and Gitea Actions CI workflow.

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

docker-compose.yml

@@ -0,0 +1,6 @@
+services:
+  app:
+    image: ${IMAGE:-2048:local}
+    restart: unless-stopped
+    ports:
+      - "${PORT:-3009}:80"