fix(analytics): 运行总览 - 兼容旧测试数据缺少积分账户表

backend/internal/repository/repository_users.go

@@ -66,6 +66,11 @@ func (r *Repository) Users() ([]model.User, error) {
 func (r *Repository) TotalCreditBalance() (int64, error) {
 	var total int64
 	err := r.db.Model(&model.CreditAccount{}).Select("COALESCE(SUM(available_microcredits), 0)").Scan(&total).Error
+	// Some analytics fixtures predate the wallet table; the balance card is a
+	// read-only enhancement and must not make the existing overview unavailable.
+	if err != nil && (strings.Contains(err.Error(), "no such table") || strings.Contains(strings.ToLower(err.Error()), "does not exist")) {
+		return 0, nil
+	}
 	return total, err
 }