Add Docker deployment support

- Add Dockerfile for containerization
- Add docker-compose.yml for easy deployment
- Add .dockerignore to optimize build
- Add .env.example for environment configuration
- Add DOCKER_DEPLOY.md with comprehensive deployment guide

Support for:
- Local Docker deployment
- Cloud platforms (Render, Railway, Fly.io, GCP, AWS)
- Persistent storage configuration
- Health checks and monitoring

.env.example

@@ -0,0 +1,3 @@
+# API 认证配置
+# 从 Factory 获取你的 refresh token
+DROID_REFRESH_KEY=your_refresh_token_here