feat(docker): implement full frontend Next.js containerization and multi-service docker-compose

- Create multi-stage standalone Dockerfile for Next.js frontend (node:20-alpine, non-root nextjs:nodejs user)
- Configure output: 'standalone' in refer_landing_page/next.config.js
- Add refer_landing_page/.dockerignore for build context optimization
- Wire anl-backend and anl-frontend services in root docker-compose.yml with healthchecks, network dependencies, and persistent volume storage

docker-compose.yml

@@ -14,13 +14,37 @@ services:
       - GIN_MODE=release
       - CORS_ALLOW_ORIGINS=*
       - AUTO_MIGRATE=true
+      - ADMIN_TOKEN=${ADMIN_TOKEN:-anl-admin-secret-token-2026}
     volumes:
       - anl-db-data:/app/data
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8080/api/v1/health"]
-      interval: 30s
+      interval: 10s
       timeout: 3s
       retries: 3
+      start_period: 5s
+
+  anl-frontend:
+    build:
+      context: ./refer_landing_page
+      dockerfile: Dockerfile
+    container_name: anl-frontend-web
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=production
+      - PORT=3000
+      - NEXT_PUBLIC_API_URL=http://localhost:8080/api/v1
+    depends_on:
+      anl-backend:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:3000"]
+      interval: 15s
+      timeout: 3s
+      retries: 3
+      start_period: 10s
 
 volumes:
   anl-db-data:

refer_landing_page/.dockerignore

@@ -0,0 +1,14 @@
+Dockerfile
+.dockerignore
+node_modules
+npm-debug.log
+README.md
+.next
+.git
+.gitignore
+.env*.local
+tests
+scripts
+.mam
+.agents
+.venv

refer_landing_page/Dockerfile

@@ -0,0 +1,54 @@
+# ==============================================================================
+# Stage 1: Install dependencies
+# ==============================================================================
+FROM node:20-alpine AS deps
+WORKDIR /app
+
+# Install libc6-compat for compatibility
+RUN apk add --no-cache libc6-compat
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# ==============================================================================
+# Stage 2: Build the Next.js application
+# ==============================================================================
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Set build-time environment variables
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NODE_ENV=production
+
+RUN npm run build
+
+# ==============================================================================
+# Stage 3: Production runner
+# ==============================================================================
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 nextjs
+
+# Copy static assets and standalone build output
+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
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000 || exit 1
+
+CMD ["node", "server.js"]

refer_landing_page/next.config.js

@@ -1,6 +1,7 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
+  output: "standalone",
   async redirects() {
     return [
       {