fix(query): 支持12位纯数字时间编号(如202609040184)商品编号的精准索引路由

backend/internal/modules/listing/query.go

@@ -104,8 +104,8 @@ func (r *Repository) applyAdminListFilters(db *gorm.DB, query AdminListQuery) *g
 		if strings.HasPrefix(upper, "RO") || strings.HasPrefix(upper, "ORD") {
 			// 订单号：命中 rental_orders(order_no) 唯一索引
 			db = db.Where("EXISTS (SELECT 1 FROM rental_orders AS o WHERE o.listing_id = l.id AND o.order_no = ?)", keyword)
-		} else if strings.HasPrefix(upper, "L") {
-			// 商品编号：命中 rental_listings(listing_no) 唯一索引
+		} else if strings.HasPrefix(upper, "L") || (len(keyword) >= 12 && isAllDigits(keyword)) {
+			// 商品编号（如 L前缀或时间计算生成的 12位纯数字如 202609040184）：命中 rental_listings(listing_no) 唯一索引
 			db = db.Where("l.listing_no = ?", keyword)
 		} else if id, err := strconv.ParseUint(keyword, 10, 64); err == nil && id > 0 && keyword[0] != '0' && id < 100000000 {
 			db = db.Where(
@@ -277,3 +277,16 @@ func (r *Repository) nextListingNo(tx *gorm.DB, now time.Time) (string, error) {
 	}
 	return fmt.Sprintf("%s%04d", bizDate, seq), nil
 }
+
+func isAllDigits(s string) bool {
+	if s == "" {
+		return false
+	}
+	for i := 0; i < len(s); i++ {
+		if s[i] < '0' || s[i] > '9' {
+			return false
+		}
+	}
+	return true
+}
+