feat(admin): show coupon rate calculation details

src/app/(main)/coupon-data/page.tsx

@@ -137,11 +137,6 @@ const slotRateMean = (rows: CouponSlotRow[]): number | null => {
   return rates.length ? rates.reduce((a, b) => a + b, 0) / rates.length : null;
 };
 
-// 汇总卡成功率口径 tooltip 文案
-const POINT_RATE_HINT =
-  '点位成功率(合计):当前区间内全部券成功率的算术平均(每张券等权);' +
-  '单券成功率=成功(含已领)÷尝试(不含跳过),源自领券每券记录。';
-
 // 按券表:coupon_id 平台 → 中文
 const SLOT_PLATFORM: Record<string, string> = {
   'meituan-waimai': '美团',
@@ -597,6 +592,10 @@ export default function CouponDataPage() {
   const successDenominator = summary ? Math.max(0, summary.started_count - abandonedCount) : 0;
   const couponSuccessRate =
     summary && successDenominator > 0 ? summary.completed_count / successDenominator : null;
+  const validCouponSlots = couponSlots.filter((r) => r.success_rate != null);
+  const pointSuccessRate = slotRateMean(validCouponSlots);
+  const pointSucceededTotal = validCouponSlots.reduce((total, r) => total + r.succeeded, 0);
+  const pointTriedTotal = validCouponSlots.reduce((total, r) => total + r.tried, 0);
   const items = data?.items ?? [];
 
   return (
@@ -714,8 +713,19 @@ export default function CouponDataPage() {
               <Statistic
                 title={
                   <span>
-                    领券成功率{' '}
-                    <Tooltip title="领券完成数 ÷（领券发起数－中途退出数）">
+                    领券完成率{' '}
+                    <Tooltip
+                      overlayStyle={{ maxWidth: 520 }}
+                      title={
+                        <div>
+                          <div>计算逻辑：领券完成数 ÷（领券发起数－中途退出数）</div>
+                          <div style={{ marginTop: 6 }}>
+                            本期：{summary.completed_count} ÷（{summary.started_count}－{abandonedCount}）
+                            ＝ {fmtPct(couponSuccessRate)}
+                          </div>
+                        </div>
+                      }
+                    >
                       <InfoCircleOutlined style={{ color: '#999' }} />
                     </Tooltip>
                   </span>
@@ -728,12 +738,33 @@ export default function CouponDataPage() {
                 title={
                   <span>
                     点位成功率{' '}
-                    <Tooltip title={POINT_RATE_HINT}>
+                    <Tooltip
+                      overlayStyle={{ maxWidth: 560 }}
+                      title={
+                        <div>
+                          <div>计算逻辑：全部单券成功率的算术平均，每张券等权。</div>
+                          <div>单券成功率＝成功数（含已领）÷ 尝试数（不含跳过）。</div>
+                          <div style={{ marginTop: 6 }}>
+                            本期共 {validCouponSlots.length} 张有效券：
+                          </div>
+                          {validCouponSlots.map((slot) => (
+                            <div key={slot.coupon_id}>
+                              {slot.coupon_name || slot.coupon_id}：{slot.succeeded} ÷ {slot.tried}＝
+                              {fmtPct(slot.success_rate)}
+                            </div>
+                          ))}
+                          <div style={{ marginTop: 6 }}>
+                            等权平均＝{fmtPct(pointSuccessRate)}；累计成功/尝试＝
+                            {pointSucceededTotal}/{pointTriedTotal}（累计数仅辅助核对，不作为当前加权公式）。
+                          </div>
+                        </div>
+                      }
+                    >
                       <InfoCircleOutlined style={{ color: '#999' }} />
                     </Tooltip>
                   </span>
                 }
-                value={fmtPct(slotRateMean(couponSlots))}
+                value={fmtPct(pointSuccessRate)}
               />
             </Col>
             <Col flex="1 1 0">