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>

deploy/nginx/default.conf

@@ -0,0 +1,48 @@
+upstream web_app {
+    server web:3000;
+}
+
+upstream admin_app {
+    server admin:3000;
+}
+
+server {
+    listen 80;
+    server_name _;
+
+    client_max_body_size 50M;
+
+    # Web app (default)
+    location / {
+        proxy_pass http://web_app;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_cache_bypass $http_upgrade;
+    }
+
+    # Admin app
+    location /admin/ {
+        rewrite ^/admin/(.*) /$1 break;
+        proxy_pass http://admin_app;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_cache_bypass $http_upgrade;
+    }
+
+    # Health check
+    location /health {
+        access_log off;
+        return 200 'ok';
+        add_header Content-Type text/plain;
+    }
+}