fix(HEL-494): 日K默认45根并修复问天行业0/205覆盖

悬浮窗和详情页只画最近45个交易日，中枢仍保留250日历史。盘后缺sw_daily时保留成分日线内核，外显走免费申万；成分行情改为全市场快照+分页，不再截成前60只。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

frontend/m/js/pages.js

@@ -3402,9 +3402,9 @@
     const payload = detail && detail.payload ? detail.payload : {};
     const meta = payload.meta || {};
     if (tab === "daily") {
-      const bars = (payload.prices || []).slice(-48);
+      const bars = (payload.prices || []).slice(-45);
       const last = bars.length ? bars[bars.length - 1].trade_date : "";
-      return "日线 · 近48根 · 至 " + (displayCompactDate(last) || "--");
+      return "日线 · 近45根 · 至 " + (displayCompactDate(last) || "--");
     }
     const d = displayCompactDate(meta.intraday_trade_date) || displayCompactDate(meta.trade_date);
     return "分时 · " + (d || "--");
@@ -3702,7 +3702,7 @@
     const W = 360, H = 240, padL = 8, padR = 52, padT = 10, padB = 22;
     const pw = W - padL - padR;
     const ph = H - padT - padB;
-    const prices = (payload.prices || []).slice(-48);
+    const prices = (payload.prices || []).slice(-45);
 
     if (prices.length < 2) return emptyChart("日线数据暂不可用");