feat: 微服务架构拆分和前后端优化

后端:
- 拆分出 agent_service, runtime_service, trading_service, news_service
- Gateway 模块化拆分 (gateway_*.py)
- 添加 domains/ 领域层
- 新增 control_client, runtime_client
- 更新 start-dev.sh 支持 split 服务模式

前端:
- 完善 API 服务层 (newsApi, tradingApi)
- 更新 vite.config.js
- Explain 组件优化

测试:
- 添加多个服务 app 测试

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/data/provider_router.py

@@ -11,7 +11,7 @@ import pandas as pd
 import yfinance as yf
 
 from backend.config.data_config import DataSource, get_data_sources
-from backend.data.schema import (
+from shared.schema import (
     CompanyFactsResponse,
     CompanyNews,
     CompanyNewsResponse,