Add Dockerfile + nginx for Coolify deployment

Multi-stage build (node -> nginx) serving the Vite static output on
port 80, matching the dockerfile build pack used for other apps.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.dockerignore

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

Dockerfile

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+# Build the Vite app, then serve the static output with nginx.
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Single-page app: unknown paths fall back to index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Hashed Vite build assets are immutable — cache hard
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}