feat: 更新钱包充值逻辑，自动处理充值订单支付，模拟支付成功返回

backend/app/services/order.go

@@ -234,8 +234,17 @@ func (s *order) payWithBalance(ctx context.Context, o *models.Order) (*transacti
 func (s *order) settleOrder(ctx context.Context, o *models.Order, method, externalID string) error {
 	var tenantOwnerID int64
 	err := models.Q.Transaction(func(tx *models.Query) error {
-		// 1. Deduct User Balance (Only for balance method)
+		// 1. Handle Balance Updates
-		if method == "balance" {
+		if o.Type == consts.OrderTypeRecharge {
+			// Income: Recharge (Credit User Balance)
+			_, err := tx.User.WithContext(ctx).
+				Where(tx.User.ID.Eq(o.UserID)).
+				Update(tx.User.Balance, gorm.Expr("balance + ?", o.AmountPaid))
+			if err != nil {
+				return err
+			}
+		} else if method == "balance" {
+			// Expense: Purchase with Balance (Deduct User Balance)
 			info, err := tx.User.WithContext(ctx).
 				Where(tx.User.ID.Eq(o.UserID), tx.User.Balance.Gte(o.AmountPaid)).
 				Update(tx.User.Balance, gorm.Expr("balance - ?", o.AmountPaid))
@@ -283,7 +292,8 @@ func (s *order) settleOrder(ctx context.Context, o *models.Order, method, extern
 			}
 		}
 
-		// 4. Create Tenant Ledger (Revenue)
+		// 4. Create Tenant Ledger (Revenue) - Only for Content Purchase
+		if o.Type == consts.OrderTypeContentPurchase {
 			t, err := tx.Tenant.WithContext(ctx).Where(tx.Tenant.ID.Eq(o.TenantID)).First()
 			if err != nil {
 				return err
@@ -320,6 +330,7 @@ func (s *order) settleOrder(ctx context.Context, o *models.Order, method, extern
 			if err := tx.TenantLedger.WithContext(ctx).Create(ledger); err != nil {
 				return err
 			}
+		}
 
 		return nil
 	})

backend/app/services/wallet.go

@@ -96,9 +96,15 @@ func (s *wallet) Recharge(
 		return nil, errorx.ErrDatabaseError.WithCause(err)
 	}
 
+	// MOCK: Automatically pay for recharge order to close the loop
+	// In production, this would be a callback from payment gateway
+	if err := Order.ProcessExternalPayment(ctx, cast.ToString(order.ID), "mock_auto_pay"); err != nil {
+		return nil, err
+	}
+
 	// Mock Pay Params
 	return &user_dto.RechargeResponse{
-		PayParams: "mock_recharge_url",
+		PayParams: "mock_paid_success",
 		OrderID:   cast.ToString(order.ID),
 	}, nil
 }