Add production Docker setup

- Dockerfile: multi-stage build (deps → builder → standalone runner)
- docker-compose.prod.yml: app on port 3010 + PostgreSQL 16
- entrypoint.sh: runs prisma migrate deploy then starts node server
- next.config.ts: standalone output for minimal Docker image
- .dockerignore: exclude dev files from build context

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

Dockerfile

@@ -0,0 +1,49 @@
+# Stage 1: Install all dependencies
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Stage 2: Build
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+# Generate Prisma client before build
+RUN npx prisma generate
+RUN npm run build
+
+# Stage 3: Production runner (standalone)
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 nextjs
+
+# Standalone output
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+# Prisma: migrations + generated client
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/src/generated ./src/generated
+COPY --from=builder /app/prisma.config.ts ./prisma.config.ts
+COPY --from=builder /app/tsconfig.json ./tsconfig.json
+
+# Copy prisma CLI + dotenv for migrate deploy in entrypoint
+COPY --from=builder /app/node_modules/.bin/prisma /usr/local/bin/prisma
+COPY --from=builder /app/node_modules/prisma ./node_modules/prisma
+COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
+COPY --from=builder /app/node_modules/dotenv ./node_modules/dotenv
+
+COPY entrypoint.sh ./entrypoint.sh
+RUN chmod +x entrypoint.sh
+
+USER nextjs
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["./entrypoint.sh"]