feat(server/codes): GrantRewardTx 复用 applySubscription 发奖励会员天数

server/internal/codes/paygrant.go

@@ -29,3 +29,21 @@ func (svc *Service) GrantPaidSubscriptionTx(
 	_ = svc.store.WriteAuditLog(ctx, tx, fmt.Sprintf("user:%d", userID), "pay_grant", ref, string(meta))
 	return subID, expiresAt, nil
 }
+
+// GrantRewardTx 发放奖励会员天数(Pro,source∈{invite,task}),与付费/兑换码同一条
+// applySubscription 延时逻辑(max(到期,now)+days;已有活跃 pro 则原地顺延)。审计走 audit_log。
+func (svc *Service) GrantRewardTx(
+	ctx context.Context, tx *sql.Tx, userID int64, days int, source, auditAction, ref string,
+) (int64, time.Time, error) {
+	planID, err := svc.store.GetPlanIDTx(ctx, tx, PlanPro)
+	if err != nil {
+		return 0, time.Time{}, err
+	}
+	subID, expiresAt, err := svc.applySubscription(ctx, tx, userID, planID, days, source)
+	if err != nil {
+		return 0, time.Time{}, err
+	}
+	meta, _ := json.Marshal(map[string]any{"days": days, "source": source, "sub_id": subID})
+	_ = svc.store.WriteAuditLog(ctx, tx, fmt.Sprintf("user:%d", userID), auditAction, ref, string(meta))
+	return subID, expiresAt, nil
+}