refactor(ledger): 抛弃单一个股的 CNY 折算，全面重构基于 Native 原生币种的成本与盈亏算法

Memory.md

@@ -65,3 +65,12 @@
 - 升級了 Dashboard 資產卡片 UI，新增累計分紅展示，並優化了成本數據的格式化判斷邏輯。
 - 修復了 `avgCostFormatted` 的判空邏輯，將 `Big.eq(0)` 修正為 `Big.eq('0')`，確保當 `pos.avgCost` 存在且不為 0 時能正確格式化，不再顯示 `¥-`。
 - 在資產卡片中新增「累計分紅」行，展示 `accumulatedDividendsCny` 數據，保持與其它 CNY 數據一致的 `opacity-50` 樣式。
+
+## 持倉引擎 Native 幣種算法重構 (Task 38)
+- 重構底層盈虧引擎，全面轉向 Native 原生幣種計算，新增浮動/累計盈虧及百分比指標。
+- 徹底分離 Native 與 CNY 計算：單隻股票的成本與盈虧全部改用 Native (原幣種) 進行計算。
+- 新增 Native 成本指標：`totalBuyCostNative` (總買入成本)、`realizedPnlNative` (已實現盈虧)、`accumulatedDividendsNative` (累計分紅)。
+- 新增 Native 成本均價：`avgCostNative = totalBuyCostNative / totalBuyQuantity`、`dilutedCostNative = (totalBuyCostNative - realizedPnlNative - accumulatedDividendsNative) / currentQuantity`。
+- 新增浮動盈虧指標：`marketValueNative = latestPrice * currentQuantity`、`floatingPnlNative = marketValueNative - (avgCostNative * currentQuantity)`、`floatingPnlPercent = floatingPnlNative / (avgCostNative * currentQuantity) * 100`。
+- 新增累計盈虧指標：`cumulativePnlNative = floatingPnlNative + realizedPnlNative + accumulatedDividendsNative`、`cumulativePnlPercent = cumulativePnlNative / totalBuyCostNative * 100`。
+- SELL 交易的已實現盈虧計算從 CNY 基準改為 Native 基準，CNY 計算保留用於前端兼容展示。

src/actions/portfolio.ts

@@ -27,6 +27,16 @@ interface Position {
   exchange: string;
   accumulatedDividendsCny: string;
   accumulatedDividendsNative: string;
+  // Native 原生币种盈亏指标
+  totalBuyCostNative: string;
+  realizedPnlNative: string;
+  avgCostNative: string;
+  dilutedCostNative: string;
+  marketValueNative: string;
+  floatingPnlNative: string;
+  floatingPnlPercent: string;
+  cumulativePnlNative: string;
+  cumulativePnlPercent: string;
 }
 
 interface RawRate {
@@ -159,6 +169,7 @@ export async function getPortfolioPositions(): Promise<Position[]> {
     totalBuyQuantity: Big;
     // 已实现盈亏
     realizedPnlCny: Big;
+    realizedPnlNative: Big;
     accumulatedDividendsCny: Big;
     accumulatedDividendsNative: Big;
     // 首次买入日期
@@ -183,6 +194,7 @@ export async function getPortfolioPositions(): Promise<Position[]> {
         totalBuyCostNative: new Big('0'),
         totalBuyQuantity: new Big('0'),
         realizedPnlCny: new Big('0'),
+        realizedPnlNative: new Big('0'),
         accumulatedDividendsCny: new Big('0'),
         accumulatedDividendsNative: new Big('0'),
         firstBuyDate: null,
@@ -211,14 +223,19 @@ export async function getPortfolioPositions(): Promise<Position[]> {
         holding.firstBuyDate = new Date(tx.executedAt);
       }
     } else if (tx.txType === 'SELL') {
-      // 计算卖出时的平均成本
+      // 计算卖出时的平均成本 (Native)
-      let avgCostPerUnit = new Big('0');
+      let avgCostPerUnitNative = new Big('0');
       if (holding.totalBuyQuantity.gt(0)) {
-        avgCostPerUnit = holding.totalBuyCostCny.div(holding.totalBuyQuantity);
+        avgCostPerUnitNative = holding.totalBuyCostNative.div(holding.totalBuyQuantity);
       }
 
-      // 已实现盈亏 = (卖出价 - 平均成本) * 卖出数量 * 汇率
+      // 已实现盈亏 = (卖出价 - 平均成本) * 卖出数量 (Native)
-      const sellRevenueCny = new Big(tx.quantity).times(new Big(tx.price));
+      const sellRevenueNative = new Big(tx.quantity).times(new Big(tx.price));
+      const costBasisNative = avgCostPerUnitNative.times(new Big(tx.quantity));
+      const realizedPnlNative = sellRevenueNative.minus(costBasisNative);
+      holding.realizedPnlNative = holding.realizedPnlNative.plus(realizedPnlNative);
+
+      // 已实现盈亏 (CNY) 保留兼容
       let appliedRate = tx.exchangeRate;
       if ((!appliedRate || appliedRate === '1' || appliedRate === '1.00000000') && tx.txCurrency !== 'CNY') {
         const fallbackRate = getRate(rateMap, tx.txCurrency, 'CNY');
@@ -226,10 +243,14 @@ export async function getPortfolioPositions(): Promise<Position[]> {
           appliedRate = fallbackRate;
         }
       }
-      const sellRevenueCnyAdjusted = sellRevenueCny.times(new Big(appliedRate || '1'));
+      const sellRevenueCny = new Big(tx.quantity).times(new Big(tx.price)).times(new Big(appliedRate || '1'));
-      const costBasisCny = avgCostPerUnit.times(new Big(tx.quantity));
+      let avgCostPerUnitCny = new Big('0');
-      const realizedPnl = sellRevenueCnyAdjusted.minus(costBasisCny);
+      if (holding.totalBuyQuantity.gt(0)) {
-      holding.realizedPnlCny = holding.realizedPnlCny.plus(realizedPnl);
+        avgCostPerUnitCny = holding.totalBuyCostCny.div(holding.totalBuyQuantity);
+      }
+      const costBasisCny = avgCostPerUnitCny.times(new Big(tx.quantity));
+      const realizedPnlCny = sellRevenueCny.minus(costBasisCny);
+      holding.realizedPnlCny = holding.realizedPnlCny.plus(realizedPnlCny);
 
       holding.quantity = holding.quantity.minus(new Big(tx.quantity));
     } else if (tx.txType === 'AIRDROP') {
@@ -259,21 +280,53 @@ export async function getPortfolioPositions(): Promise<Position[]> {
       rateMap
     );
 
-    // 未实现盈亏 = 当前市值 - 总买入成本
+    // 未实现盈亏 (CNY)
     const unrealizedPnlCny = cnyValue.minus(holding.totalBuyCostCny);
-    // 总盈亏 = 当前市值 - 总买入成本 + 已实现盈亏 + 累计分红
+    // 总盈亏 (CNY)
     const totalPnlCny = unrealizedPnlCny.plus(holding.realizedPnlCny).plus(holding.accumulatedDividendsCny);
 
-    const currentNativeValue = new Big(holding.latestPrice).times(holding.quantity);
+    // Native 原生币种计算
-    const pnlNative = currentNativeValue.minus(holding.totalBuyCostNative).plus(holding.accumulatedDividendsNative);
+    const marketValueNative = new Big(holding.latestPrice).times(holding.quantity);
+    const currentNativeValue = marketValueNative;
 
-    // 平均成本 = 总买入成本 / 总买入数量
+    // 平均成本 (Native) = 总买入成本 (Native) / 总买入数量
+    let avgCostNative = new Big('0');
+    if (holding.totalBuyQuantity.gt(0)) {
+      avgCostNative = holding.totalBuyCostNative.div(holding.totalBuyQuantity);
+    }
+
+    // 摊薄成本 (Native) = (总买入成本 - 已实现盈亏 - 累计分红) / 当前持仓数量
+    let dilutedCostNative = new Big('0');
+    if (holding.quantity.gt(0)) {
+      dilutedCostNative = holding.totalBuyCostNative.minus(holding.realizedPnlNative).minus(holding.accumulatedDividendsNative).div(holding.quantity);
+    }
+
+    // 浮动盈亏 (Native) = 市值 - (平均成本 * 当前持仓数量)
+    const floatingPnlNative = marketValueNative.minus(avgCostNative.times(holding.quantity));
+
+    // 浮动盈亏百分比 (Native)
+    let floatingPnlPercent = new Big('0');
+    const avgCostBasisNative = avgCostNative.times(holding.quantity);
+    if (avgCostBasisNative.gt(0)) {
+      floatingPnlPercent = floatingPnlNative.div(avgCostBasisNative).times(new Big('100'));
+    }
+
+    // 累计盈亏 (Native) = 浮动盈亏 + 已实现盈亏 + 累计分红
+    const cumulativePnlNative = floatingPnlNative.plus(holding.realizedPnlNative).plus(holding.accumulatedDividendsNative);
+
+    // 累计盈亏百分比 (Native) = 累计盈亏 / 总买入成本 * 100
+    let cumulativePnlPercent = new Big('0');
+    if (holding.totalBuyCostNative.gt(0)) {
+      cumulativePnlPercent = cumulativePnlNative.div(holding.totalBuyCostNative).times(new Big('100'));
+    }
+
+    // 平均成本 (CNY) 保留兼容
     let avgCost = new Big('0');
     if (holding.totalBuyQuantity.gt(0)) {
       avgCost = holding.totalBuyCostCny.div(holding.totalBuyQuantity);
     }
 
-    // 摊薄成本 = (总买入成本 - 已实现盈亏 - 总分红) / 当前持仓数量
+    // 摊薄成本 (CNY) 保留兼容
     let dilutedCost = new Big('0');
     if (holding.quantity.gt(0)) {
       dilutedCost = holding.totalBuyCostCny.minus(holding.realizedPnlCny).minus(holding.accumulatedDividendsCny).div(holding.quantity);
@@ -286,6 +339,9 @@ export async function getPortfolioPositions(): Promise<Position[]> {
       holdingDays = Math.max(0, Math.floor(diffMs / (1000 * 60 * 60 * 24)));
     }
 
+  // Native 原生币种总盈亏 (保留兼容)
+    const pnlNative = marketValueNative.minus(holding.totalBuyCostNative).plus(holding.accumulatedDividendsNative);
+
     result.push({
       assetId: holding.assetId,
       symbol: holding.symbol,
@@ -304,9 +360,19 @@ export async function getPortfolioPositions(): Promise<Position[]> {
       avgCost: avgCost.toString(),
       dilutedCost: dilutedCost.toString(),
       holdingDays,
-     exchange: holding.exchange,
+      exchange: holding.exchange,
       accumulatedDividendsCny: holding.accumulatedDividendsCny.toString(),
       accumulatedDividendsNative: holding.accumulatedDividendsNative.toString(),
+      // Native 原生币种盈亏指标
+      totalBuyCostNative: holding.totalBuyCostNative.toString(),
+      realizedPnlNative: holding.realizedPnlNative.toString(),
+      avgCostNative: avgCostNative.toString(),
+      dilutedCostNative: dilutedCostNative.toString(),
+      marketValueNative: marketValueNative.toString(),
+      floatingPnlNative: floatingPnlNative.toString(),
+      floatingPnlPercent: floatingPnlPercent.toString(),
+      cumulativePnlNative: cumulativePnlNative.toString(),
+      cumulativePnlPercent: cumulativePnlPercent.toString(),
     });
   }