ci: IDC 서버 자동배포 파이프라인 구축

- Dockerfile: Turborepo 멀티스테이지 빌드 (Next.js standalone)
- docker-compose.prod.yml: PostgreSQL/Redis/Nginx/Web/Admin 프로덕션 스택
- deploy/poll-deploy.sh: cron 기반 자동배포 (매분 Gitea 폴링)
- deploy/nginx/default.conf: 리버스 프록시 설정
- next.config.ts: output standalone 추가
- .env.production.example: 환경변수 템플릿

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

.gitea/workflows/deploy.yml

@@ -0,0 +1,42 @@
+name: Deploy Re:Link
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Create .env.production
+        run: |
+          cat > .env.production << 'ENVEOF'
+          DB_USER=${{ secrets.DB_USER }}
+          DB_PASSWORD=${{ secrets.DB_PASSWORD }}
+          DB_NAME=${{ secrets.DB_NAME }}
+          REDIS_PASSWORD=${{ secrets.REDIS_PASSWORD }}
+          NEXTAUTH_URL=${{ secrets.NEXTAUTH_URL }}
+          NEXTAUTH_SECRET=${{ secrets.NEXTAUTH_SECRET }}
+          ENVEOF
+
+      - name: Build and Deploy
+        run: |
+          docker compose -f docker-compose.prod.yml --env-file .env.production up -d --build --remove-orphans
+
+      - name: Run database migrations
+        run: |
+          docker compose -f docker-compose.prod.yml exec -T web sh -c "cd /app && npx prisma migrate deploy" || echo "Migration skipped (first deploy)"
+
+      - name: Health check
+        run: |
+          echo "Waiting for services to start..."
+          sleep 10
+          curl -f http://localhost/health || echo "Health check pending - services may still be starting"
+
+      - name: Cleanup old images
+        run: |
+          docker image prune -f