feat: add position history API and frontend integration

- Add /positions/history API endpoint
- Add position history types and API client
- Add translations for position history page
- Integrate PositionHistory component in App

web/src/i18n/translations.ts

@@ -1091,6 +1091,55 @@ export const translations = {
       privatekeyObfuscationFailed: 'Clipboard obfuscation failed',
     },
 
+    // Position History
+    positionHistory: {
+      title: 'Position History',
+      loading: 'Loading position history...',
+      noHistory: 'No Position History',
+      noHistoryDesc: 'Closed positions will appear here after trading.',
+      showingPositions: 'Showing {count} of {total} positions',
+      totalPnL: 'Total P&L',
+      // Stats
+      totalTrades: 'Total Trades',
+      winLoss: 'Win: {win} / Loss: {loss}',
+      winRate: 'Win Rate',
+      profitFactor: 'Profit Factor',
+      profitFactorDesc: 'Total Profit / Total Loss',
+      plRatio: 'P/L Ratio',
+      plRatioDesc: 'Avg Win / Avg Loss',
+      sharpeRatio: 'Sharpe Ratio',
+      sharpeRatioDesc: 'Risk-adjusted Return',
+      maxDrawdown: 'Max Drawdown',
+      avgWin: 'Avg Win',
+      avgLoss: 'Avg Loss',
+      netPnL: 'Net P&L',
+      netPnLDesc: 'After Fees',
+      fee: 'Fee',
+      // Direction Stats
+      trades: 'Trades',
+      avgPnL: 'Avg P&L',
+      // Symbol Performance
+      symbolPerformance: 'Symbol Performance',
+      // Filters
+      symbol: 'Symbol',
+      allSymbols: 'All Symbols',
+      side: 'Side',
+      all: 'All',
+      sort: 'Sort',
+      latestFirst: 'Latest First',
+      oldestFirst: 'Oldest First',
+      highestPnL: 'Highest P&L',
+      lowestPnL: 'Lowest P&L',
+      // Table Headers
+      entry: 'Entry',
+      exit: 'Exit',
+      qty: 'Qty',
+      lev: 'Lev',
+      pnl: 'P&L',
+      duration: 'Duration',
+      closedAt: 'Closed At',
+    },
+
     // Debate Arena Page
     debatePage: {
       title: 'Market Debate Arena',
@@ -2188,6 +2237,55 @@ export const translations = {
       privatekeyObfuscationFailed: '剪贴板混淆失败',
     },
 
+    // Position History
+    positionHistory: {
+      title: '历史仓位',
+      loading: '加载历史仓位...',
+      noHistory: '暂无历史仓位',
+      noHistoryDesc: '平仓后的仓位记录将显示在此处',
+      showingPositions: '显示 {count} / {total} 条记录',
+      totalPnL: '总盈亏',
+      // Stats
+      totalTrades: '总交易次数',
+      winLoss: '盈利: {win} / 亏损: {loss}',
+      winRate: '胜率',
+      profitFactor: '盈利因子',
+      profitFactorDesc: '总盈利 / 总亏损',
+      plRatio: '盈亏比',
+      plRatioDesc: '平均盈利 / 平均亏损',
+      sharpeRatio: '夏普比率',
+      sharpeRatioDesc: '风险调整收益',
+      maxDrawdown: '最大回撤',
+      avgWin: '平均盈利',
+      avgLoss: '平均亏损',
+      netPnL: '净盈亏',
+      netPnLDesc: '扣除手续费后',
+      fee: '手续费',
+      // Direction Stats
+      trades: '交易次数',
+      avgPnL: '平均盈亏',
+      // Symbol Performance
+      symbolPerformance: '品种表现',
+      // Filters
+      symbol: '交易对',
+      allSymbols: '全部交易对',
+      side: '方向',
+      all: '全部',
+      sort: '排序',
+      latestFirst: '最新优先',
+      oldestFirst: '最早优先',
+      highestPnL: '盈利最高',
+      lowestPnL: '亏损最多',
+      // Table Headers
+      entry: '开仓价',
+      exit: '平仓价',
+      qty: '数量',
+      lev: '杠杆',
+      pnl: '盈亏',
+      duration: '持仓时长',
+      closedAt: '平仓时间',
+    },
+
     // Debate Arena Page
     debatePage: {
       title: '行情辩论大赛',