chore(stock-webai): pass WEBAI_API_KEY env to stock container

Required by /api/webai/* endpoints. Operator must set WEBAI_API_KEY
in NAS /volume1/docker/webpage/.env before deploy.

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

docker-compose.yml

@@ -43,6 +43,7 @@ services:
       - OLLAMA_URL=${OLLAMA_URL:-http://192.168.45.59:11435}
       - OLLAMA_MODEL=${OLLAMA_MODEL:-qwen3:14b}
       - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
+      - WEBAI_API_KEY=${WEBAI_API_KEY}
     volumes:
       - ${RUNTIME_PATH}/data/stock:/app/data
     healthcheck: