fix(ledger): 修复汇率转换的双标幻觉，统一大盘与快照的财务聚合基准

src/actions/snapshots.ts

@@ -26,13 +26,19 @@ function getTodayInShanghai(): string {
 export async function recordDailySnapshot() {
   const positions = await getPortfolioPositions();
 
+  // 统一使用 engine 输出的 marketValueCny / accumulatedPnlCny
   const totalValueCny = positions.reduce(
-    (sum, pos) => sum.plus(pos.cnyValue || '0'),
+    (sum, pos) => sum.plus(new Big(pos.marketValueCny || '0')),
     new Big(0)
   ).toString();
 
+  // 推导真实投入本金 CNY = 市值 - 累计盈亏
   const totalCostCny = positions.reduce(
-    (sum, pos) => sum.plus(pos.totalCostCny || '0'),
+    (sum, pos) => {
+      const mv = new Big(pos.marketValueCny || '0');
+      const ap = new Big(pos.accumulatedPnlCny || '0');
+      return sum.plus(mv.minus(ap));
+    },
     new Big(0)
   ).toString();
 
@@ -324,21 +330,16 @@ export async function reconstructPortfolioHistory() {
       const priceStr = await getEffectivePrice(assetId, currentDate);
       const baseCurrency = assetBaseCurrencyMap.get(assetId) || 'USD';
 
-      let cnyPrice: string;
-      if (!priceStr) {
-        cnyPrice = convertPriceToCny(assetLatestPriceMap.get(assetId) || '0', baseCurrency);
-      } else {
-        cnyPrice = convertPriceToCny(priceStr, baseCurrency);
-      }
+      const priceStrForMetrics = priceStr || assetLatestPriceMap.get(assetId) || '0';
 
-      const metrics = calculateAssetMetrics(assetTxs, cnyPrice);
+      const metrics = calculateAssetMetrics(assetTxs, priceStrForMetrics);
 
       // 获取资产对人民币的汇率
       const assetFxRate = new Big(getRate(baseCurrency, 'CNY') || '1');
 
-      // marketValue 已使用 CNY 价格计算，直接取用
-      // totalInvested 基于原始币种价格，需乘以汇率折算为 CNY
-      const posValueCny = new Big(metrics.marketValue);
+      // 统一汇率折算边界：calculateAssetMetrics 输出全部为 Base Currency，
+      // 必须无例外地将所有金额字段乘以 fxRate 得到 CNY
+      const posValueCny = new Big(metrics.marketValue).times(assetFxRate);
       const posCostCny = new Big(metrics.totalInvested).times(assetFxRate);
 
       totalValueCny = totalValueCny.plus(posValueCny);