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/apps/runtime_service.py

@@ -0,0 +1,68 @@
+# -*- coding: utf-8 -*-
+"""Dedicated runtime service FastAPI surface."""
+
+from __future__ import annotations
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from backend.api import runtime_router
+from backend.api.runtime import get_runtime_state
+
+
+def create_app() -> FastAPI:
+    """Create the runtime service app."""
+    app = FastAPI(
+        title="EvoTraders Runtime Service",
+        description="Runtime lifecycle and gateway service surface extracted from the monolith",
+        version="0.1.0",
+    )
+
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=["*"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    @app.get("/health")
+    async def health_check() -> dict[str, object]:
+        """Health check for the runtime service."""
+        runtime_state = get_runtime_state()
+        process = runtime_state.gateway_process
+        is_running = process is not None and process.poll() is None
+        return {
+            "status": "healthy",
+            "service": "runtime-service",
+            "gateway_running": is_running,
+            "gateway_port": runtime_state.gateway_port,
+        }
+
+    @app.get("/api/status")
+    async def api_status() -> dict[str, object]:
+        """Service-level status payload for runtime orchestration."""
+        runtime_state = get_runtime_state()
+        process = runtime_state.gateway_process
+        is_running = process is not None and process.poll() is None
+        return {
+            "status": "operational",
+            "service": "runtime-service",
+            "runtime": {
+                "gateway_running": is_running,
+                "gateway_port": runtime_state.gateway_port,
+                "has_runtime_manager": runtime_state.runtime_manager is not None,
+            },
+        }
+
+    app.include_router(runtime_router)
+    return app
+
+
+app = create_app()
+
+
+if __name__ == "__main__":
+    import uvicorn
+
+    uvicorn.run(app, host="0.0.0.0", port=8003)