feat(task-watcher): services/docker-compose entry (SP-10)

port 18713, REDIS_URL/STOCK_BASE_URL/TRADING_START/END env.
insta/music/video-render와 같은 services 묶음. outbound only.
Plan-B-Infra Phase 2 완료 — 박재오 빌드 대기.

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

services/docker-compose.yml

@@ -76,3 +76,22 @@ services:
       interval: 60s
       timeout: 5s
       retries: 3
+
+  task-watcher:
+    build:
+      context: ./task-watcher
+    container_name: task-watcher
+    restart: unless-stopped
+    ports:
+      - "18713:8000"
+    environment:
+      - TZ=Asia/Seoul
+      - REDIS_URL=${REDIS_URL:-redis://192.168.45.54:6379}
+      - STOCK_BASE_URL=${STOCK_BASE_URL:-http://192.168.45.54:18500}
+      - TRADING_START=${TRADING_START:-07:00}
+      - TRADING_END=${TRADING_END:-16:30}
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 60s
+      timeout: 5s
+      retries: 3