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/runtime_client.py

@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+"""Runtime service client for lifecycle and gateway operations."""
+
+from __future__ import annotations
+
+import httpx
+
+
+class RuntimeServiceClient:
+    """Async client for the runtime-service API surface."""
+
+    def __init__(self, base_url: str = "http://localhost:8003/api/runtime"):
+        self.base_url = base_url.rstrip("/")
+        self._client: httpx.AsyncClient | None = None
+
+    async def __aenter__(self) -> "RuntimeServiceClient":
+        self._client = httpx.AsyncClient(base_url=self.base_url, timeout=30.0)
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb) -> None:
+        if self._client:
+            await self._client.aclose()
+
+    async def fetch_context(self) -> dict:
+        response = await self._client.get("/context")
+        response.raise_for_status()
+        return response.json()
+
+    async def fetch_agents(self) -> dict:
+        response = await self._client.get("/agents")
+        response.raise_for_status()
+        return response.json()
+
+    async def fetch_events(self) -> dict:
+        response = await self._client.get("/events")
+        response.raise_for_status()
+        return response.json()
+
+    async def fetch_gateway_port(self) -> dict:
+        response = await self._client.get("/gateway/port")
+        response.raise_for_status()
+        return response.json()
+
+    async def start_runtime(self, config: dict) -> dict:
+        response = await self._client.post("/start", json=config)
+        response.raise_for_status()
+        return response.json()
+
+    async def stop_runtime(self, *, force: bool = True) -> dict:
+        response = await self._client.post(f"/stop?force={str(force).lower()}")
+        response.raise_for_status()
+        return response.json()
+
+    async def restart_runtime(self, config: dict) -> dict:
+        response = await self._client.post("/restart", json=config)
+        response.raise_for_status()
+        return response.json()
+
+    async def fetch_current_runtime(self) -> dict:
+        response = await self._client.get("/current")
+        response.raise_for_status()
+        return response.json()
+
+    async def get_runtime_config(self) -> dict:
+        response = await self._client.get("/config")
+        response.raise_for_status()
+        return response.json()
+
+    async def update_runtime_config(self, config: dict) -> dict:
+        response = await self._client.put("/config", json=config)
+        response.raise_for_status()
+        return response.json()