feat(services): docker-compose for insta-render worker (SP-3)

Windows WSL2 Docker용. NAS Redis 6379 + NAS API 18700 호출.
/mnt/nas SMB 볼륨 마운트. INTERNAL_API_KEY는 NAS .env와 같은 값.
.env는 .gitignore (박재오 머신 로컬 보관).

Plan-B-Insta Phase 2 마무리.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

services/docker-compose.yml

@@ -0,0 +1,25 @@
+name: web-ai-services
+
+services:
+  insta-render:
+    build:
+      context: ./insta-render
+    container_name: insta-render
+    restart: unless-stopped
+    ports:
+      - "18710:8000"
+    environment:
+      - TZ=Asia/Seoul
+      - REDIS_URL=${REDIS_URL:-redis://192.168.45.54:6379}
+      - NAS_BASE_URL=${NAS_BASE_URL:-http://192.168.45.54:18700}
+      - INTERNAL_API_KEY=${INTERNAL_API_KEY:-}
+      - INSTA_MEDIA_ROOT=${INSTA_MEDIA_ROOT:-/mnt/nas/webpage/data/insta}
+      - INSTA_MEDIA_URL_PREFIX=${INSTA_MEDIA_URL_PREFIX:-/media/insta}
+      - CARD_TEMPLATE_DIR=/app/templates
+    volumes:
+      - /mnt/nas/webpage/data/insta:/mnt/nas/webpage/data/insta
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 60s
+      timeout: 5s
+      retries: 3