Add frontend Dockerfile and integrate into docker-compose

- Multi-stage Dockerfile (deps → build → runner) for optimized production image
- Enable Next.js standalone output for minimal container size
- Add .dockerignore to exclude dev artifacts from build context
- Add frontend service to docker-compose.yml with API dependency

https://claude.ai/code/session_01QU6gpDgMtX4b9k1UXTivEf

frontend/.dockerignore

@@ -0,0 +1,7 @@
+node_modules
+.next
+.git
+.gitignore
+*.md
+.env*
+vitest.config.ts

frontend/Dockerfile

@@ -0,0 +1,42 @@
+FROM node:22-alpine AS base
+
+# --- Dependencies stage ---
+FROM base AS deps
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# --- Build stage ---
+FROM base AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN npm run build
+
+# --- Production stage ---
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]

frontend/next.config.ts

@@ -1,7 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  output: "standalone",
 };
 
 export default nextConfig;