perf(query): 优化后台手机号精确查询

backend/internal/modules/dispute/query.go

@@ -134,11 +134,9 @@ func (r *Repository) adminDisputeCountQuery(ctx context.Context, query AdminList
 			Joins("JOIN rental_orders AS o ON o.id = d.order_id").
 			Joins("JOIN rental_listings AS l ON l.id = o.listing_id")
 	}
-	if len(kw) == 11 && kw[0] == '1' && isAllDigits(kw) {
+	if isPhoneKeyword(kw) {
 		return r.db.WithContext(ctx).Table("disputes AS d").
-			Joins("JOIN rental_orders AS o ON o.id = d.order_id").
-			Joins("JOIN users AS owner ON owner.id = o.owner_id").
-			Joins("JOIN users AS renter ON renter.id = o.renter_id")
+			Joins("JOIN rental_orders AS o ON o.id = d.order_id")
 	}
 	return r.adminFilterQuery(ctx)
 }
@@ -152,9 +150,13 @@ func applyAdminListFilters(db *gorm.DB, query AdminListQuery) *gorm.DB {
 	}
 	if keyword := strings.TrimSpace(query.Keyword); keyword != "" {
 		upper := strings.ToUpper(keyword)
-		if len(keyword) == 11 && keyword[0] == '1' && isAllDigits(keyword) {
-			// 11 位手机号：命中 users(phone) 唯一索引
-			db = db.Where("(owner.phone = ? OR renter.phone = ?)", keyword, keyword)
+		if isPhoneKeyword(keyword) {
+			// 先由 users(phone) 唯一索引解析用户，再走订单号主/租客索引。
+			db = db.Where(
+				"(o.owner_id = (SELECT id FROM users WHERE phone = ?) OR o.renter_id = (SELECT id FROM users WHERE phone = ?))",
+				keyword,
+				keyword,
+			)
 		} else 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("o.order_no = ?", keyword)
@@ -190,3 +192,7 @@ func isAllDigits(s string) bool {
 	}
 	return true
 }
+
+func isPhoneKeyword(s string) bool {
+	return len(s) == 11 && s[0] == '1' && isAllDigits(s)
+}

backend/internal/modules/dispute/repository_test.go

@@ -770,9 +770,9 @@ func TestApplyAdminListFiltersSmartRouting(t *testing.T) {
 		wantSQLFrag string
 	}{
 		{
-			name:        "11位手机号路由至users(phone)",
+			name:        "11位手机号先解析用户再走订单角色索引",
 			query:       AdminListQuery{Keyword: "13800138000"},
-			wantSQLFrag: "owner.phone = ? OR renter.phone = ?",
+			wantSQLFrag: "o.owner_id = (SELECT id FROM users WHERE phone = ?)",
 		},
 		{
 			name:        "RO前缀订单号路由至rental_orders(order_no)",