feat(portfolio): 백엔드 서비스 + 인프라 설정

- FastAPI 앱: DB(5테이블), Pydantic 모델, 토큰 인증, 전체 API 라우트
- Docker Compose: portfolio 서비스 (포트 18850)
- Nginx: /api/profile/ → portfolio:8000
- 배포 스크립트: portfolio 추가

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nginx/default.conf

@@ -140,6 +140,16 @@ server {
   }
 
 
+  # profile API (Portfolio Service)
+  location /api/profile/ {
+    proxy_http_version 1.1;
+    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_pass http://portfolio:8000/api/profile/;
+  }
+
   # agent-office API + WebSocket
   location /api/agent-office/ {
     resolver 127.0.0.11 valid=10s;