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/services/gateway_cycle_support.py

@@ -8,7 +8,7 @@ import logging
 from typing import Any
 
 from backend.data.market_ingest import ingest_symbols
-from backend.domains import trading as trading_domain
+from backend.tools.data_tools import get_market_cap
 from backend.utils.msg_adapter import FrontendAdapter
 
 logger = logging.getLogger(__name__)
@@ -265,8 +265,7 @@ async def get_market_caps(gateway: Any, tickers: list[str], date: str) -> dict[s
             if response is not None:
                 market_cap = response.get("market_cap")
             if market_cap is None:
-                payload = trading_domain.get_market_cap_payload(ticker=ticker, end_date=date)
-                market_cap = payload.get("market_cap")
+                market_cap = get_market_cap(ticker=ticker, end_date=date)
             market_caps[ticker] = market_cap if market_cap else 1e9
         except Exception as exc:
             logger.warning("Failed to get market cap for %s, using default 1e9: %s", ticker, exc)