feat: add Dockerfile for static Flux frontend

.dockerignore

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+node_modules/
+.git/
+app/dist/
+**/dist/
+.turbo/
+*.log
+.DS_Store
+.env*

Dockerfile

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+# Stage 1: Build the static frontend
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY . .
+RUN npm install -g yarn@1.22.22
+RUN yarn install --frozen-lockfile || yarn install
+RUN NODE_OPTIONS='--max-old-space-size=4096' yarn build
+
+# Stage 2: Serve with nginx
+FROM nginx:alpine
+COPY --from=builder /app/app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

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+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA fallback
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}