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/domains/trading.py

@@ -0,0 +1,106 @@
+# -*- coding: utf-8 -*-
+"""Trading domain helpers shared by app surfaces and gateway fallbacks."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from backend.services.market import MarketService
+from backend.tools.data_tools import (
+    get_company_news,
+    get_financial_metrics,
+    get_insider_trades,
+    get_market_cap,
+    get_prices,
+    search_line_items,
+)
+
+
+def get_prices_payload(*, ticker: str, start_date: str, end_date: str) -> dict[str, Any]:
+    return {
+        "ticker": ticker,
+        "prices": get_prices(ticker, start_date, end_date),
+    }
+
+
+def get_financials_payload(
+    *,
+    ticker: str,
+    end_date: str,
+    period: str = "ttm",
+    limit: int = 10,
+) -> dict[str, Any]:
+    return {
+        "financial_metrics": get_financial_metrics(
+            ticker=ticker,
+            end_date=end_date,
+            period=period,
+            limit=limit,
+        )
+    }
+
+
+def get_news_payload(
+    *,
+    ticker: str,
+    end_date: str,
+    start_date: str | None = None,
+    limit: int = 1000,
+) -> dict[str, Any]:
+    return {
+        "news": get_company_news(
+            ticker=ticker,
+            end_date=end_date,
+            start_date=start_date,
+            limit=limit,
+        )
+    }
+
+
+def get_insider_trades_payload(
+    *,
+    ticker: str,
+    end_date: str,
+    start_date: str | None = None,
+    limit: int = 1000,
+) -> dict[str, Any]:
+    return {
+        "insider_trades": get_insider_trades(
+            ticker=ticker,
+            end_date=end_date,
+            start_date=start_date,
+            limit=limit,
+        )
+    }
+
+
+def get_market_status_payload() -> dict[str, Any]:
+    market_service = MarketService(tickers=[])
+    return market_service.get_market_status()
+
+
+def get_market_cap_payload(*, ticker: str, end_date: str) -> dict[str, Any]:
+    return {
+        "ticker": ticker,
+        "end_date": end_date,
+        "market_cap": get_market_cap(ticker, end_date),
+    }
+
+
+def get_line_items_payload(
+    *,
+    ticker: str,
+    line_items: list[str],
+    end_date: str,
+    period: str = "ttm",
+    limit: int = 10,
+) -> dict[str, Any]:
+    return {
+        "search_results": search_line_items(
+            ticker=ticker,
+            line_items=line_items,
+            end_date=end_date,
+            period=period,
+            limit=limit,
+        )
+    }