Checkpoint React frontend migration

frontend/Dockerfile

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+# Build Stage
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm install
+
+COPY . .
+
+# Pass build arg to env for vite
+ARG VITE_API_URL
+ENV VITE_API_URL=${VITE_API_URL}
+
+RUN npm run build
+
+# Production Stage
+FROM nginx:alpine
+
+# Copy built assets
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy nginx config
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]