P2: print→logging 전환, 포트폴리오 중복 제거, Docker healthcheck 추가

- backend/main.py: logging 모듈 도입, print() 제거
- stock-lab/main.py: print() → logger 전환, _calc_portfolio_totals 공용 함수 추출
- stock-lab/scraper.py: logging 모듈 도입, print() 제거
- docker-compose.yml: 전 서비스 healthcheck 블록 추가 (30s 간격, 3회 재시도)

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

docker-compose.yml

@@ -16,6 +16,11 @@ services:
       - LOTTO_LATEST_URL=${LOTTO_LATEST_URL:-https://smok95.github.io/lotto/results/latest.json}
     volumes:
       - ${RUNTIME_PATH}/data:/app/data
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
 
   stock-lab:
     build:
@@ -36,6 +41,11 @@ services:
       - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
     volumes:
       - ${STOCK_DATA_PATH:-./data/stock}:/app/data
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
 
   music-lab:
     build:
@@ -51,6 +61,11 @@ services:
       - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
     volumes:
       - ${MUSIC_DATA_PATH:-./data/music}:/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
@@ -58,7 +73,7 @@ services:
     restart: unless-stopped
     user: "${PUID}:${PGID}"
     ports:
-      - "19000:8000"	# 내부 확인용
+      - "19000:8000"
     environment:
       - TZ=${TZ:-Asia/Seoul}
       - TRAVEL_ROOT=${TRAVEL_ROOT:-/data/travel}
@@ -69,6 +84,11 @@ services:
     volumes:
       - ${PHOTO_PATH}:/data/travel:ro
       - ${RUNTIME_PATH}/travel-thumbs:/data/thumbs:rw
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
 
   frontend:
     image: nginx:alpine
@@ -86,13 +106,18 @@ services:
       - ${MUSIC_DATA_PATH:-./data/music}:/data/music:ro
     extra_hosts:
       - "host.docker.internal:host-gateway"
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:80/"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
 
   deployer:
     build: ./deployer
     container_name: webpage-deployer
     restart: unless-stopped
     ports:
-      - "127.0.0.1:19010:9000"   # localhost만 허용 (nginx /webhook 프록시 경유)
+      - "127.0.0.1:19010:9000"
     environment:
       - WEBHOOK_SECRET=${WEBHOOK_SECRET}
     volumes: