Change trade_date to String type to avoid SQLAlchemy datetime conversion errors

Deploy to Hugging Face Spaces - SQLite version with 10k sample data

Enhances platform with robust monitoring and notifications

feat: 完成多国家海关数据源接入与核心功能全量迭代

feat(customs): 完成美墨两国海关数据连接器开发与文档适配

feat: 新增智利海关数据接入链路，完善系统框架与文档

chore: 添加开发辅助脚本用于测试和数据库检查

feat: 新增贸易查询筛选条件并完善巴西贸易数据解析

feat: 接入巴西真实海关数据源并优化回补逻辑与HTTP客户端

chore: change DB to SQLite for Hugging Face Space deployment

Initial commit for Hugging Face Space