feat(admin-web): add production Dockerfile (multi-stage, Next.js standalone)

admin-web/Dockerfile

@@ -0,0 +1,42 @@
+# ── Build stage ──
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install dependencies (leveraging Docker layer cache)
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy source and build
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+# ── Runtime stage ──
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Create non-root user
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 nextjs
+
+# Copy standalone output from builder
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+# Set correct ownership
+RUN chown -R nextjs:nodejs /app
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]