feat: 架构修复 - P0/P1 问题全面修复

P0 修复:
- runtimeStore: 添加缺失的 lastDayHistory 字段
- Gateway/RuntimeService: 状态同步改为内存优先，消除 glob 竞态
- App.jsx: 从 3075 行重构到 ~500 行，提取 8 个独立文件

P1 修复:
- CORS: 4 个服务改为从环境变量读取允许 origins
- MarketStore: 改为模块级单例模式
- Domain 层: 删除 trading thin wrapper，保留 news 真实逻辑
- 测试: 补齐 77 个 gateway/runtime 测试

新增文件:
- backend/tests/test_gateway.py (43 tests)
- frontend/src/hooks/useWebSocketHandler.js
- frontend/src/hooks/useStockRequestCallbacks.js
- frontend/src/hooks/useAgentCallbacks.js
- frontend/src/hooks/useRuntimeCallbacks.js
- frontend/src/hooks/useWatchlistCallbacks.js
- frontend/src/components/TickerBar.jsx
- frontend/src/components/HeaderRight.jsx
- frontend/src/components/ChartTabs.jsx

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/tests/test_trading_domain.py

@@ -1,47 +1,21 @@
 # -*- coding: utf-8 -*-
-"""Unit tests for the trading domain helpers."""
+"""Unit tests for data_tools functions (replaces the deleted trading_domain)."""
 
-from backend.domains import trading as trading_domain
+from backend.tools.data_tools import (
+    get_company_news,
+    get_financial_metrics,
+    get_insider_trades,
+    get_market_cap,
+    get_prices,
+    search_line_items,
+)
 
 
-def test_trading_domain_payload_wrappers(monkeypatch):
-    monkeypatch.setattr(trading_domain, "get_prices", lambda ticker, start_date, end_date: [{"close": 1}])
-    monkeypatch.setattr(trading_domain, "get_financial_metrics", lambda ticker, end_date, period, limit: [{"ticker": ticker}])
-    monkeypatch.setattr(trading_domain, "get_company_news", lambda ticker, end_date, start_date=None, limit=1000: [{"ticker": ticker}])
-    monkeypatch.setattr(trading_domain, "get_insider_trades", lambda ticker, end_date, start_date=None, limit=1000: [{"ticker": ticker}])
-    monkeypatch.setattr(trading_domain, "get_market_cap", lambda ticker, end_date: 2.5e12)
-
-    assert trading_domain.get_prices_payload(ticker="AAPL", start_date="2026-03-01", end_date="2026-03-16") == {
-        "ticker": "AAPL",
-        "prices": [{"close": 1}],
-    }
-    assert trading_domain.get_financials_payload(ticker="AAPL", end_date="2026-03-16") == {
-        "financial_metrics": [{"ticker": "AAPL"}],
-    }
-    assert trading_domain.get_news_payload(ticker="AAPL", end_date="2026-03-16") == {
-        "news": [{"ticker": "AAPL"}],
-    }
-    assert trading_domain.get_insider_trades_payload(ticker="AAPL", end_date="2026-03-16") == {
-        "insider_trades": [{"ticker": "AAPL"}],
-    }
-    assert trading_domain.get_market_cap_payload(ticker="AAPL", end_date="2026-03-16") == {
-        "ticker": "AAPL",
-        "end_date": "2026-03-16",
-        "market_cap": 2.5e12,
-    }
-
-
-def test_get_market_status_payload_uses_market_service(monkeypatch):
-    class _FakeMarketService:
-        def __init__(self, tickers):
-            self.tickers = tickers
-
-        def get_market_status(self):
-            return {"status": "open", "status_text": "Open"}
-
-    monkeypatch.setattr(trading_domain, "MarketService", _FakeMarketService)
-
-    assert trading_domain.get_market_status_payload() == {
-        "status": "open",
-        "status_text": "Open",
-    }
+def test_data_tools_functions_exist():
+    """Verify that all data_tools functions are importable and callable."""
+    assert callable(get_prices)
+    assert callable(get_financial_metrics)
+    assert callable(get_company_news)
+    assert callable(get_insider_trades)
+    assert callable(get_market_cap)
+    assert callable(search_line_items)