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_stock_handlers.py

@@ -11,10 +11,9 @@ from typing import Any
 
 from backend.data.provider_utils import normalize_symbol
 from backend.domains import news as news_domain
-from backend.domains import trading as trading_domain
 from backend.enrich.news_enricher import enrich_news_for_symbol
 from backend.enrich.llm_enricher import llm_enrichment_enabled
-from backend.tools.data_tools import prices_to_df
+from backend.tools.data_tools import get_insider_trades, get_prices, prices_to_df
 from shared.client import NewsServiceClient, TradingServiceClient
 
 logger = logging.getLogger(__name__)
@@ -59,13 +58,12 @@ async def handle_get_stock_history(gateway: Any, websocket: Any, data: dict[str,
     if not prices:
         prices = await asyncio.to_thread(gateway.storage.market_store.get_ohlc, ticker, start_date, end_date)
         if not prices:
-            payload = await asyncio.to_thread(
-                trading_domain.get_prices_payload,
+            prices = await asyncio.to_thread(
+                get_prices,
                 ticker=ticker,
                 start_date=start_date,
                 end_date=end_date,
             )
-            prices = payload.get("prices") or []
             usage_snapshot = gateway._provider_router.get_usage_snapshot()
             source = usage_snapshot.get("last_success", {}).get("prices")
             if prices:
@@ -400,14 +398,13 @@ async def handle_get_stock_insider_trades(gateway: Any, websocket: Any, data: di
         trades = response.insider_trades
 
     if not trades:
-        payload = await asyncio.to_thread(
-            trading_domain.get_insider_trades_payload,
+        trades = await asyncio.to_thread(
+            get_insider_trades,
             ticker=ticker,
             end_date=end_date,
             start_date=start_date if start_date else None,
             limit=limit,
         )
-        trades = payload.get("insider_trades") or []
 
     sorted_trades = sorted(trades, key=lambda t: t.transaction_date or "", reverse=True)
     formatted_trades = [{
@@ -540,12 +537,11 @@ async def handle_get_stock_technical_indicators(gateway: Any, websocket: Any, da
             prices = response.prices
 
         if prices is None:
-            payload = trading_domain.get_prices_payload(
+            prices = get_prices(
                 ticker=ticker,
                 start_date=start_date.strftime("%Y-%m-%d"),
                 end_date=end_date.strftime("%Y-%m-%d"),
             )
-            prices = payload.get("prices") or []
 
         if not prices or len(prices) < 20:
             await websocket.send(json.dumps({