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>

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80