fix: improve frontend UX and fix OKX close position

Frontend improvements:
- Replace window.location.reload() with SWR mutate() for data refresh
- Replace native alert/confirm with toast notifications (confirmToast, notify)
- Add loading skeletons to AITradersPage and EquityChart
- Fix flash of empty state during initial load
OKX fixes:
- Fix proxy issue in Docker by using explicit no-proxy function
- Fix CloseShort sz parameter error - ensure quantity is always positive
- Fix GetPositions to return absolute value for positionAmt

web/src/App.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react'
-import useSWR from 'swr'
+import useSWR, { mutate } from 'swr'
 import { api } from './lib/api'
 import { ChartTabs } from './components/ChartTabs'
 import { AITradersPage } from './components/AITradersPage'
@@ -15,6 +15,7 @@ import { LanguageProvider, useLanguage } from './contexts/LanguageContext'
 import { AuthProvider, useAuth } from './contexts/AuthContext'
 import { ConfirmDialogProvider } from './components/ConfirmDialog'
 import { t, type Language } from './i18n/translations'
+import { confirmToast, notify } from './lib/notify'
 import { useSystemConfig } from './hooks/useSystemConfig'
 import { DecisionCard } from './components/DecisionCard'
 import { BacktestPage } from './components/BacktestPage'
@@ -535,17 +536,26 @@ function TraderDetailsPage({
       ? `确定要平仓 ${symbol} ${side === 'LONG' ? '多仓' : '空仓'} 吗？`
       : `Are you sure you want to close ${symbol} ${side === 'LONG' ? 'LONG' : 'SHORT'} position?`
 
-    if (!confirm(confirmMsg)) return
+    const confirmed = await confirmToast(confirmMsg, {
+      title: language === 'zh' ? '确认平仓' : 'Confirm Close',
+      okText: language === 'zh' ? '确认' : 'Confirm',
+      cancelText: language === 'zh' ? '取消' : 'Cancel',
+    })
+
+    if (!confirmed) return
 
     setClosingPosition(symbol)
     try {
       await api.closePosition(selectedTraderId, symbol, side)
-      const successMsg = language === 'zh' ? '平仓成功' : 'Position closed successfully'
-      alert(successMsg)
-      window.location.reload()
+      notify.success(language === 'zh' ? '平仓成功' : 'Position closed successfully')
+      // 使用 SWR mutate 刷新数据而非重新加载页面
+      await Promise.all([
+        mutate(`positions-${selectedTraderId}`),
+        mutate(`account-${selectedTraderId}`),
+      ])
     } catch (err: unknown) {
       const errorMsg = err instanceof Error ? err.message : (language === 'zh' ? '平仓失败' : 'Failed to close position')
-      alert(errorMsg)
+      notify.error(errorMsg)
     } finally {
       setClosingPosition(null)
     }