feat(ledger): 重构盈亏计算引擎，实装摊薄/平均成本双重指标与持仓天数统计

app/dashboard/page.tsx

@@ -15,11 +15,13 @@ const CHART_COLORS = [
 ];
 
 export default async function DashboardPage() {
-  const { positions, totalCnyValue, chartData, totalPnlCny } = await getPortfolioSummary();
+  const { positions, totalCnyValue, chartData, totalPnlCny, unrealizedPnlCny } = await getPortfolioSummary();
 
   const formattedTotal = formatAmount(totalCnyValue);
-  const formattedPnl = formatAmount(totalPnlCny);
-  const pnlIsPositive = new Big(totalPnlCny).gte(0);
+  const formattedTotalPnl = formatAmount(totalPnlCny);
+  const formattedUnrealized = formatAmount(unrealizedPnlCny);
+  const totalPnlIsPositive = new Big(totalPnlCny).gte(0);
+  const unrealizedIsPositive = new Big(unrealizedPnlCny).gte(0);
 
   const displayChartData = chartData.map((item) => ({
     ...item,
@@ -50,11 +52,19 @@ export default async function DashboardPage() {
               总资产 (CNY)
             </span>
           </div>
-          <div className="mt-2 flex items-center gap-2">
-            <span className="text-sm text-muted-foreground">总盈亏:</span>
-            <span className={`text-lg font-semibold ${pnlIsPositive ? 'text-green-500' : 'text-red-500'}`}>
-              {pnlIsPositive ? '+' : ''}{formattedPnl}
-            </span>
+          <div className="mt-3 flex flex-wrap gap-4">
+            <div className="flex items-center gap-2">
+              <span className="text-sm text-muted-foreground">持仓盈亏:</span>
+              <span className={`text-lg font-semibold ${unrealizedIsPositive ? 'text-green-500' : 'text-red-500'}`}>
+                {unrealizedIsPositive ? '+' : ''}{formattedUnrealized}
+              </span>
+            </div>
+            <div className="flex items-center gap-2">
+              <span className="text-sm text-muted-foreground">总盈亏:</span>
+              <span className={`text-lg font-semibold ${totalPnlIsPositive ? 'text-green-500' : 'text-red-500'}`}>
+                {totalPnlIsPositive ? '+' : ''}{formattedTotalPnl}
+              </span>
+            </div>
           </div>
         </CardContent>
       </Card>
@@ -72,6 +82,12 @@ export default async function DashboardPage() {
             const posPnlPositive = posPnl.gte(0);
             const formattedPosPnl = formatAmount(pos.pnlCny);
 
+            const posPnlNative = new Big(pos.pnlNative);
+            const posPnlNativePositive = posPnlNative.gte(0);
+
+            const avgCostFormatted = new Big(pos.avgCost).gt(0) ? formatAmount(pos.avgCost) : '-';
+            const dilutedCostFormatted = new Big(pos.dilutedCost).gt(0) ? formatAmount(pos.dilutedCost) : '-';
+
             return (
               <Card key={pos.assetId}>
                 <CardHeader>
@@ -97,24 +113,36 @@ export default async function DashboardPage() {
                       <span className="text-muted-foreground">结算币种</span>
                       <span className="font-medium">{pos.baseCurrency}</span>
                     </div>
+                    <div className="flex justify-between">
+                      <span className="text-muted-foreground">平均成本</span>
+                      <span className="font-medium">
+                        ¥{avgCostFormatted}
+                      </span>
+                    </div>
+                    <div className="flex justify-between">
+                      <span className="text-muted-foreground">摊薄成本</span>
+                      <span className="font-medium">
+                        ¥{dilutedCostFormatted}
+                      </span>
+                    </div>
+                    <div className="flex justify-between">
+                      <span className="text-muted-foreground">持仓天数</span>
+                      <span className="font-medium">
+                        {pos.holdingDays} 天
+                      </span>
+                    </div>
                     <div className="flex justify-between">
                       <span className="text-muted-foreground">持仓成本 ({pos.baseCurrency})</span>
                       <span className="font-medium">
                         {formatAmount(pos.totalCostNative)}
                       </span>
                     </div>
-                    {(() => {
-                      const posPnlNative = new Big(pos.pnlNative);
-                      const posPnlNativePositive = posPnlNative.gte(0);
-                      return (
-                        <div className="flex justify-between">
-                          <span className="text-muted-foreground">当前盈亏 ({pos.baseCurrency})</span>
-                          <span className={`font-semibold ${posPnlNativePositive ? 'text-green-500' : 'text-red-500'}`}>
-                            {posPnlNativePositive ? '+' : ''}{formatAmount(pos.pnlNative)}
-                          </span>
-                        </div>
-                      );
-                    })()}
+                    <div className="flex justify-between">
+                      <span className="text-muted-foreground">当前盈亏 ({pos.baseCurrency})</span>
+                      <span className={`font-semibold ${posPnlNativePositive ? 'text-green-500' : 'text-red-500'}`}>
+                        {posPnlNativePositive ? '+' : ''}{formatAmount(pos.pnlNative)}
+                      </span>
+                    </div>
                     <div className="flex justify-between opacity-50">
                       <span className="text-muted-foreground">成本 (CNY)</span>
                       <span className="font-medium">
@@ -124,7 +152,7 @@ export default async function DashboardPage() {
                     <div className="flex justify-between opacity-50">
                       <span className="text-muted-foreground">盈亏 (CNY)</span>
                       <span className={`font-semibold ${posPnlPositive ? 'text-green-500' : 'text-red-500'}`}>
-                        {posPnlPositive ? '+' : ''}{formatAmount(pos.pnlCny)}
+                        {posPnlPositive ? '+' : ''}{formattedPosPnl}
                       </span>
                     </div>
                   </div>