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>

shared/client/__init__.py

@@ -1,12 +1,14 @@
 # -*- coding: utf-8 -*-
 """Shared client package."""
 
+from shared.client.control_client import ControlPlaneClient
 from shared.client.trading_client import TradingServiceClient
 from shared.client.news_client import NewsServiceClient
-from shared.client.agent_client import AgentServiceClient
+from shared.client.runtime_client import RuntimeServiceClient
 
 __all__ = [
+    "ControlPlaneClient",
+    "RuntimeServiceClient",
     "TradingServiceClient",
     "NewsServiceClient",
-    "AgentServiceClient",
 ]