Squashed 'core/' content from commit 92ec910

git-subtree-dir: core
git-subtree-split: 92ec910a132e379a3a6e442a75bcb07cac0f0010

frontend/Dockerfile.prod

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+# Multi-stage production build for standalone use
+# In docker-compose.prod.yml, the nginx Dockerfile handles frontend building directly
+
+# Stage 1: Build
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve with nginx
+FROM nginx:1.27-alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# SPA fallback
+RUN echo 'server { listen 80; root /usr/share/nginx/html; index index.html; location / { try_files $uri $uri/ /index.html; } }' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]