feat(portfolio): 支持显示已清仓历史持仓，增加防乱码 CSV 导出功能

src/actions/portfolio.ts

@@ -173,7 +173,7 @@ function getTodayInShanghai(): Date {
   return new Date(utcDate.getTime() + shanghaiOffset);
 }
 
-export async function getPortfolioPositions(): Promise<Position[]> {
+export async function getPortfolioPositions(includeCleared: boolean = false): Promise<Position[]> {
   const allTransactions = await db
     .select({
       id: transactions.id,
@@ -334,11 +334,17 @@ export async function getPortfolioPositions(): Promise<Position[]> {
   const today = getTodayInShanghai();
   const result: Position[] = [];
 
+  const CLEARED_QUANTITY_TOLERANCE = new Big('1e-8');
+
   for (const [_, holding] of holdings) {
-    if (holding.quantity.lte(0)) continue;
+    const hasPosition = holding.quantity.gt(CLEARED_QUANTITY_TOLERANCE);
+
+    if (!hasPosition && !includeCleared) {
+      continue;
+    }
 
     const cnyValue = calculateCnyValueFromPrice(
-      holding.quantity,
+      hasPosition ? holding.quantity : new Big('0'),
       holding.latestPrice,
       holding.baseCurrency,
       rateMap
@@ -442,8 +448,8 @@ export async function getPortfolioPositions(): Promise<Position[]> {
   return result;
 }
 
-export async function getPortfolioSummary() {
-  const positions = await getPortfolioPositions();
+export async function getPortfolioSummary(includeCleared: boolean = false) {
+  const positions = await getPortfolioPositions(includeCleared);
 
   // 单一事实来源：复用 getPortfolioPositions 已汇率折算的结果
   let totalCnyValue = new Big('0');

src/actions/snapshots.ts

@@ -24,7 +24,7 @@ function getTodayInShanghai(): string {
 }
 
 export async function recordDailySnapshot() {
-  const positions = await getPortfolioPositions();
+  const positions = await getPortfolioPositions(false);
 
   // 统一使用 engine 输出的 marketValueCny / accumulatedPnlCny
   const totalValueCny = positions.reduce(