Add Docker deployment config

- Add multi-stage Dockerfile for Next.js standalone
- Add .dockerignore
- Enable standalone output in next.config.ts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,7 @@
+node_modules
+.next
+.git
+.gitignore
+*.md
+.env*.local
+.claude

Dockerfile

@@ -0,0 +1,36 @@
+FROM node:20-alpine AS base
+
+# --- Dependencies ---
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# --- Build ---
+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 ---
+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"]

next.config.ts

@@ -53,6 +53,9 @@ const securityHeaders = [
 ];
 
 const nextConfig: NextConfig = {
+  // Standalone output for Docker deployment
+  output: "standalone",
+
   // Security headers
   async headers() {
     return [