feat: implement withdrawal improvements P01-P05

- P04: fix Withdrawal.TableName() to return 'withdrawals'
- P03: add WithdrawalStatus* and WithdrawalMethod* constants; replace magic numbers; add CommissionTypeWithdrawCancel=338
- P01: add POST /v1/public/user/withdrawal_cancel to cancel pending withdrawals with ownership check, row lock, commission refund, and audit log
- P02: add method/account/qr_code_url fields to Withdrawal model and API; add input validation (qr_code_url required for Alipay/Wechat, account required for bank)
- P05: add method filter to admin GET /v1/admin/user/withdrawal/list

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/public/user/commissionWithdrawLogic.go

@@ -38,6 +38,22 @@ func (l *CommissionWithdrawLogic) CommissionWithdraw(req *types.CommissionWithdr
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.InvalidAccess), "Invalid Access")
 	}
 
+	// Validate payment method fields
+	switch req.Method {
+	case user.WithdrawalMethodAlipay, user.WithdrawalMethodWechat:
+		if req.QrCodeUrl == "" {
+			return nil, errors.Wrapf(xerr.NewErrCode(xerr.InvalidParams), "qr_code_url is required for method %d", req.Method)
+		}
+	case user.WithdrawalMethodBank:
+		if req.Account == "" {
+			return nil, errors.Wrapf(xerr.NewErrCode(xerr.InvalidParams), "account is required for bank transfer")
+		}
+	default: // WithdrawalMethodOther
+		if req.Account == "" && req.Content == "" {
+			return nil, errors.Wrapf(xerr.NewErrCode(xerr.InvalidParams), "account or content is required for other methods")
+		}
+	}
+
 	if u.Commission < req.Amount {
 		logger.Errorf("User %d has insufficient commission balance: %.2f, requested: %.2f", u.Id, float64(u.Commission)/100, float64(req.Amount)/100)
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.UserCommissionNotEnough), "User %d has insufficient commission balance", u.Id)
@@ -64,15 +80,17 @@ func (l *CommissionWithdrawLogic) CommissionWithdraw(req *types.CommissionWithdr
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseInsertError), "Failed to create commission log for user %d: %v", u.Id, err)
 	}
 
-	err = tx.Model(&user.Withdrawal{}).Create(&user.Withdrawal{
-		UserId:  u.Id,
-		Amount:  req.Amount,
-		Content: req.Content,
-		Status:  0,
-		Reason:  "",
-	}).Error
-
-	if err != nil {
+	withdrawal := &user.Withdrawal{
+		UserId:    u.Id,
+		Amount:    req.Amount,
+		Content:   req.Content,
+		Status:    user.WithdrawalStatusPending,
+		Reason:    "",
+		Method:    req.Method,
+		Account:   req.Account,
+		QrCodeUrl: req.QrCodeUrl,
+	}
+	if err = tx.Model(&user.Withdrawal{}).Create(withdrawal).Error; err != nil {
 		tx.Rollback()
 		l.Errorf("Failed to create withdrawal log for user %d: %v", u.Id, err)
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseInsertError), "Failed to create withdrawal log for user %d: %v", u.Id, err)
@@ -83,11 +101,15 @@ func (l *CommissionWithdrawLogic) CommissionWithdraw(req *types.CommissionWithdr
 	}
 
 	return &types.WithdrawalLog{
+		Id:        withdrawal.Id,
 		UserId:    u.Id,
 		Amount:    req.Amount,
 		Content:   req.Content,
-		Status:    0,
+		Status:    user.WithdrawalStatusPending,
 		Reason:    "",
+		Method:    req.Method,
+		Account:   req.Account,
+		QrCodeUrl: req.QrCodeUrl,
 		CreatedAt: now.UnixMilli(),
 		UpdatedAt: now.UnixMilli(),
 	}, nil