chore: add Dockerfile for containerized deployment

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

Dockerfile

@@ -0,0 +1,62 @@
+# 1. Base image
+FROM node:20-alpine AS base
+
+# 2. Dependencies
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+
+# Install dependencies
+COPY package.json package-lock.json* ./
+RUN npm ci --legacy-peer-deps
+
+
+# 3. Builder
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Prisma generate step - CRITICAL for standalone mode
+RUN npx prisma generate
+
+# Environment variables must be present at build time for Next.js
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN npm run build
+
+# 4. Runner
+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
+
+# Set the correct permission for prerender cache
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
+
+# Automatically leverage output traces to reduce image size
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+# We might need the prisma schema for runtime tasks if used, 
+# but for standalone, the client is already bundled.
+# However, adding it doesn't hurt for 'db push' tasks in Coolify.
+COPY --from=builder --chown=nextjs:nodejs /app/prisma ./prisma
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+# Note: In Coolify, you can run 'npx prisma db push' as a post-deployment script
+# or change CMD to a wrapper script that runs db push then starts the server.
+CMD ["node", "server.js"]