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/core/__init__.py

@@ -1,9 +1,30 @@
 # -*- coding: utf-8 -*-
-"""Core pipeline and orchestration logic"""
+"""Core pipeline and orchestration logic.
+
+Keep ``pipeline_runner`` behind lazy wrappers so importing ``backend.core`` does
+not immediately pull in the gateway runtime graph.
+"""
 
 from .pipeline import TradingPipeline
 from .state_sync import StateSync
-from .pipeline_runner import create_agents, create_long_term_memory, stop_gateway
+
+
+def create_agents(*args, **kwargs):
+    from .pipeline_runner import create_agents as _create_agents
+
+    return _create_agents(*args, **kwargs)
+
+
+def create_long_term_memory(*args, **kwargs):
+    from .pipeline_runner import create_long_term_memory as _create_long_term_memory
+
+    return _create_long_term_memory(*args, **kwargs)
+
+
+def stop_gateway(*args, **kwargs):
+    from .pipeline_runner import stop_gateway as _stop_gateway
+
+    return _stop_gateway(*args, **kwargs)
 
 __all__ = [
     "TradingPipeline",