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>

docker-compose.yml

@@ -149,6 +149,25 @@ services:
       timeout: 5s
       retries: 3
 
+  portfolio:
+    build:
+      context: ./portfolio
+    container_name: portfolio
+    restart: unless-stopped
+    ports:
+      - "18850:8000"
+    environment:
+      - TZ=${TZ:-Asia/Seoul}
+      - PORTFOLIO_EDIT_PASSWORD=${PORTFOLIO_EDIT_PASSWORD:-}
+      - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
+    volumes:
+      - ${RUNTIME_PATH:-.}/data/portfolio:/app/data
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
   travel-proxy:
     build: ./travel-proxy
     container_name: travel-proxy