chore: add Dockerfile and nginx config for Coolify deployment

.dockerignore

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+node_modules
+dist
+.git
+.vscode
+*.log
+.DS_Store

Dockerfile

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+FROM node:22-alpine AS builder
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+FROM nginx:1.27-alpine AS runner
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -qO- http://localhost/ > /dev/null || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server {
+  listen 80;
+  server_name _;
+  root /usr/share/nginx/html;
+  index index.html;
+
+  gzip on;
+  gzip_types text/plain text/css application/javascript application/json image/svg+xml;
+  gzip_min_length 256;
+
+  # Cache hashed assets aggressively
+  location /assets/ {
+    expires 1y;
+    add_header Cache-Control "public, immutable";
+    try_files $uri =404;
+  }
+
+  # SPA fallback (single page; no client routing here, but harmless)
+  location / {
+    try_files $uri $uri/ /index.html;
+    add_header Cache-Control "no-cache";
+  }
+}