feat: 添加 miniapp-api_test 测试环境自动化部署配置

- 新增 docker-compose.test.yml 测试环境配置
  - API 端口: 3001
  - MongoDB 端口: 27019
  - 独立数据卷隔离
  - SERVER_URL: https://miniapp-api-test.dxz99wyr.cn
- 新增 deploy/webhook-server.js Webhook 自动部署服务
- 新增 deploy/webhook.service systemd 服务配置
- 新增 deploy/setup.sh 一键初始化脚本
- Webhook Secret 与正式版保持一致: miniapp-api-deploy-secret

deploy/webhook.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=MiniApp API Test Webhook Auto Deploy Service
+After=network.target docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/opt/miniapp-api_test/deploy
+Environment="WEBHOOK_SECRET=miniapp-api-deploy-secret"
+ExecStart=/usr/bin/node /opt/miniapp-api_test/deploy/webhook-server.js
+Restart=always
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target