feat: 优化当日收益计算方式

app/api/AGENTS.md

@@ -0,0 +1,38 @@
+# app/api/ — Data Fetching Layer
+
+## OVERVIEW
+
+Single file (`fund.js`, ~954 lines) containing ALL external data fetching for the entire application. Pure client-side: JSONP + script tag injection to bypass CORS.
+
+## WHERE TO LOOK
+
+| Function | Purpose |
+|----------|---------|
+| `fetchFundData(code)` | Main fund data (valuation + NAV + holdings). Uses 天天基金 JSONP |
+| `fetchFundDataFallback(code)` | Backup data source when primary fails |
+| `fetchSmartFundNetValue(code, date)` | Smart NAV lookup with date fallback |
+| `searchFunds(val)` | Fund search by name/code (东方财富) |
+| `fetchFundHistory(code, range)` | Historical NAV data via pingzhongdata |
+| `fetchFundPingzhongdata(code)` | Raw eastmoney pingzhongdata (trend, grand total) |
+| `fetchMarketIndices()` | 24 A-share/HK/US indices via 腾讯财经 |
+| `fetchShanghaiIndexDate()` | Shanghai index date for trading day check |
+| `parseFundTextWithLLM(text)` | OCR text → fund codes via LLM (apis.iflow.cn) |
+| `loadScript(url)` | JSONP helper — creates script tag, waits for global var |
+| `fetchRelatedSectors(code)` | Fund sector/track info (unused in main UI) |
+
+## CONVENTIONS
+
+- **JSONP pattern**: `loadScript(url)` → sets global callback → script.onload → reads `window.XXX` → cleanup
+- **All functions return Promises** — async/await throughout
+- **Cached via `cachedRequest()`** from `app/lib/cacheRequest.js`
+- **Error handling**: try/catch returning null/empty — never throws to UI
+- **Market indices**: `MARKET_INDEX_KEYS` array defines 24 indices with `code`, `varKey`, `name`
+- **Stock code normalization**: `normalizeTencentCode()` handles A-share (6-digit), HK (5-digit), US (letter codes)
+
+## ANTI-PATTERNS (THIS DIRECTORY)
+
+- **Hardcoded API keys** (lines 911-914) — plaintext LLM service keys in source
+- **Empty catch blocks** — several `catch (e) {}` silently swallowing errors
+- **Global window pollution** — JSONP callbacks assigned to `window.jsonpgz`, `window.SuggestData_*`, etc.
+- **No retry logic** — failed requests return null, no exponential backoff
+- **Script cleanup race conditions** — scripts removed from DOM after onload/onerror, but timeout may trigger after removal

app/api/fund.js

@@ -155,6 +155,38 @@ const parseLatestNetValueFromLsjzContent = (content) => {
   return null;
 };
 
+/**
+ * 解析历史净值数据（支持多条记录）
+ * 返回按日期升序排列的净值数组
+ */
+const parseNetValuesFromLsjzContent = (content) => {
+  if (!content || content.includes('暂无数据')) return [];
+  const rowMatches = content.match(/<tr[\s\S]*?<\/tr>/gi) || [];
+  const results = [];
+  for (const row of rowMatches) {
+    const cells = row.match(/<td[^>]*>(.*?)<\/td>/gi) || [];
+    if (!cells.length) continue;
+    const getText = (td) => td.replace(/<[^>]+>/g, '').trim();
+    const dateStr = getText(cells[0] || '');
+    if (!/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) continue;
+    const navStr = getText(cells[1] || '');
+    const nav = parseFloat(navStr);
+    if (!Number.isFinite(nav)) continue;
+    let growth = null;
+    for (const c of cells) {
+      const txt = getText(c);
+      const m = txt.match(/([-+]?\d+(?:\.\d+)?)\s*%/);
+      if (m) {
+        growth = parseFloat(m[1]);
+        break;
+      }
+    }
+    results.push({ date: dateStr, nav, growth });
+  }
+  // 返回按日期升序排列的结果（API返回的是倒序，需要反转）
+  return results.reverse();
+};
+
 const extractHoldingsReportDate = (html) => {
   if (!html) return null;
 
@@ -316,16 +348,19 @@ export const fetchFundData = async (c) => {
         gszzl: Number.isFinite(gszzlNum) ? gszzlNum : json.gszzl
       };
       const lsjzPromise = new Promise((resolveT) => {
-        const url = `https://fundf10.eastmoney.com/F10DataApi.aspx?type=lsjz&code=${c}&page=1&per=1&sdate=&edate=`;
+        const url = `https://fundf10.eastmoney.com/F10DataApi.aspx?type=lsjz&code=${c}&page=1&per=2&sdate=&edate=`;
         loadScript(url)
           .then((apidata) => {
             const content = apidata?.content || '';
-            const latest = parseLatestNetValueFromLsjzContent(content);
-            if (latest && latest.nav) {
+            const navList = parseNetValuesFromLsjzContent(content);
+            if (navList.length > 0) {
+              const latest = navList[navList.length - 1];
+              const previousNav = navList.length > 1 ? navList[navList.length - 2] : null;
               resolveT({
                 dwjz: String(latest.nav),
                 zzl: Number.isFinite(latest.growth) ? latest.growth : null,
-                jzrq: latest.date
+                jzrq: latest.date,
+                lastNav: previousNav ? String(previousNav.nav) : null
               });
             } else {
               resolveT(null);
@@ -506,6 +541,7 @@ export const fetchFundData = async (c) => {
             gzData.dwjz = tData.dwjz;
             gzData.jzrq = tData.jzrq;
             gzData.zzl = tData.zzl;
+            gzData.lastNav = tData.lastNav;
           }
         }
         resolve({