feat: add Dockerfile for production deployment

Multi-stage build: Node 18 builds the Vite app, nginx serves
the static output. Nginx config proxies /api/ to the backend
container and handles SPA client-side routing with try_files.

Build args VITE_API_BASE_URL and VITE_APP_NAME are configurable
at build time via docker build --build-arg.

Made-with: Cursor

.dockerignore

@@ -0,0 +1,10 @@
+node_modules
+dist
+.git
+.env
+.env.local
+.env.production
+*.md
+docs/
+.vscode/
+coverage/

Dockerfile

@@ -0,0 +1,41 @@
+FROM node:18-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+ARG VITE_API_BASE_URL=/api
+ARG VITE_APP_NAME=EnCoach
+ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
+ENV VITE_APP_NAME=$VITE_APP_NAME
+RUN npm run build
+
+FROM nginx:stable-alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY <<'NGINX' /etc/nginx/conf.d/default.conf
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass         http://backend:8069/api/;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300s;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(?:css|js|svg|png|jpg|jpeg|gif|ico|woff2?|ttf|eot)$ {
+        expires 30d;
+        add_header Cache-Control "public, immutable";
+    }
+}
+NGINX
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]