feat: 提现优化 — 取消状态 + 收款方式 + TableName 修复 (HIF-42)

- P04: 修复 Withdrawal.TableName() 返回正确表名 withdrawals
- P03: 新增提现状态常量 (constant/withdrawal.go)，消除魔法数字 0/1/2/3；
       新增 CommissionTypeWithdrawCancel (338) 和 WithdrawalCancelForbidden 错误码
- P02: 迁移 02123 为 withdrawals 表添加 method/account/qr_code_url 列；
       扩展 Withdrawal GORM 模型和 API 类型（CommissionWithdrawRequest、WithdrawalLog）；
       申请提现时增加收款方式校验逻辑
- P01: 新增用户取消提现接口 POST /v1/public/user/withdrawal_cancel；
       仅可取消自己的待审核提现，退还佣金并写佣金日志
- P05: 管理端提现列表新增 method 过滤参数

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

internal/model/user/user.go

@@ -167,12 +167,15 @@ type Withdrawal struct {
 	UserId    int64     `gorm:"index:idx_user_id;not null;comment:User ID"`
 	Amount    int64     `gorm:"not null;comment:Withdrawal Amount"`
 	Content   string    `gorm:"type:text;comment:Withdrawal Content"`
-	Status    uint8     `gorm:"type:tinyint(1);default:0;comment:Withdrawal Status: 0: Pending 1: Approved 2: Rejected"`
+	Method    uint8     `gorm:"type:tinyint(1);default:0;comment:Payment Method: 0:Other 1:Alipay 2:WeChat 3:Bank"`
+	Account   string    `gorm:"type:varchar(255);default:'';comment:Payment Account"`
+	QrCodeUrl string    `gorm:"type:varchar(500);default:'';comment:QR Code Image URL"`
+	Status    uint8     `gorm:"type:tinyint(1);default:0;comment:Withdrawal Status: 0: Pending 1: Approved 2: Rejected 3: Cancelled"`
 	Reason    string    `gorm:"type:varchar(500);default:'';comment:Rejection Reason"`
 	CreatedAt time.Time `gorm:"<-:create;comment:Creation Time"`
 	UpdatedAt time.Time `gorm:"comment:Update Time"`
 }
 
 func (*Withdrawal) TableName() string {
-	return "user_withdrawal"
+	return "withdrawals"
 }