refactor: 将 DTO 文件从 internal/model 移动到 internal/model/dto 目录

- 移动 17 个 DTO 文件到 internal/model/dto/ 目录
- 更新所有 DTO 文件的 package 声明从 model 改为 dto
- 更新所有引用文件的 import 和类型引用
  - Handler 层：admin 和 h5 所有处理器
  - Service 层：所有业务服务
  - Routes 层：所有路由定义
  - Tests 层：单元测试和集成测试
- 清理未使用的 import 语句
- 验证：项目构建成功，测试编译通过，LSP 无错误

internal/model/dto/commission_withdrawal_setting_dto.go

@@ -0,0 +1,31 @@
+package dto
+
+type CreateWithdrawalSettingReq struct {
+	DailyWithdrawalLimit int   `json:"daily_withdrawal_limit" validate:"required,min=1,max=100" required:"true" minimum:"1" maximum:"100" description:"每日提现次数限制"`
+	MinWithdrawalAmount  int64 `json:"min_withdrawal_amount" validate:"required,min=1" required:"true" minimum:"1" description:"最低提现金额（分）"`
+	FeeRate              int64 `json:"fee_rate" validate:"required,min=0,max=10000" required:"true" minimum:"0" maximum:"10000" description:"手续费比率（基点，100=1%）"`
+}
+
+type WithdrawalSettingListReq struct {
+	Page     int `json:"page" query:"page" validate:"omitempty,min=1" minimum:"1" description:"页码（默认1）"`
+	PageSize int `json:"page_size" query:"page_size" validate:"omitempty,min=1,max=100" minimum:"1" maximum:"100" description:"每页数量（默认20，最大100）"`
+}
+
+type WithdrawalSettingItem struct {
+	ID                   uint   `json:"id" description:"配置ID"`
+	DailyWithdrawalLimit int    `json:"daily_withdrawal_limit" description:"每日提现次数限制"`
+	MinWithdrawalAmount  int64  `json:"min_withdrawal_amount" description:"最低提现金额（分）"`
+	FeeRate              int64  `json:"fee_rate" description:"手续费比率（基点，100=1%）"`
+	ArrivalDays          int    `json:"arrival_days" description:"到账天数"`
+	IsActive             bool   `json:"is_active" description:"是否生效"`
+	CreatorID            uint   `json:"creator_id" description:"创建人ID"`
+	CreatorName          string `json:"creator_name" description:"创建人用户名"`
+	CreatedAt            string `json:"created_at" description:"创建时间"`
+}
+
+type WithdrawalSettingPageResult struct {
+	Items []WithdrawalSettingItem `json:"items" description:"配置列表"`
+	Total int64                   `json:"total" description:"总记录数"`
+	Page  int                     `json:"page" description:"当前页码"`
+	Size  int                     `json:"size" description:"每页数量"`
+}