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_dto.go

@@ -0,0 +1,74 @@
+package dto
+
+// WithdrawalRequestListReq 提现申请列表查询请求
+type WithdrawalRequestListReq 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）"`
+	Status       *int   `json:"status" query:"status" validate:"omitempty,min=1,max=4" minimum:"1" maximum:"4" description:"状态 (1:待审核, 2:已通过, 3:已拒绝, 4:已到账)"`
+	WithdrawalNo string `json:"withdrawal_no" query:"withdrawal_no" validate:"omitempty,max=50" maxLength:"50" description:"提现单号（精确查询）"`
+	ShopName     string `json:"shop_name" query:"shop_name" validate:"omitempty,max=100" maxLength:"100" description:"店铺名称（模糊查询）"`
+	StartTime    string `json:"start_time" query:"start_time" validate:"omitempty" description:"申请开始时间（格式：2006-01-02 15:04:05）"`
+	EndTime      string `json:"end_time" query:"end_time" validate:"omitempty" description:"申请结束时间（格式：2006-01-02 15:04:05）"`
+}
+
+// WithdrawalRequestItem 提现申请列表项
+type WithdrawalRequestItem struct {
+	ID               uint   `json:"id" description:"提现申请ID"`
+	WithdrawalNo     string `json:"withdrawal_no" description:"提现单号"`
+	Amount           int64  `json:"amount" description:"提现金额（分）"`
+	FeeRate          int64  `json:"fee_rate" description:"手续费比率（基点，100=1%）"`
+	Fee              int64  `json:"fee" description:"手续费（分）"`
+	ActualAmount     int64  `json:"actual_amount" description:"实际到账金额（分）"`
+	Status           int    `json:"status" description:"状态 (1:待审核, 2:已通过, 3:已拒绝, 4:已到账)"`
+	StatusName       string `json:"status_name" description:"状态名称"`
+	ShopID           uint   `json:"shop_id" description:"店铺ID"`
+	ShopName         string `json:"shop_name" description:"店铺名称"`
+	ShopHierarchy    string `json:"shop_hierarchy" description:"店铺层级路径"`
+	ApplicantID      uint   `json:"applicant_id" description:"申请人账号ID"`
+	ApplicantName    string `json:"applicant_name" description:"申请人用户名"`
+	ProcessorID      *uint  `json:"processor_id,omitempty" description:"处理人账号ID"`
+	ProcessorName    string `json:"processor_name,omitempty" description:"处理人用户名"`
+	WithdrawalMethod string `json:"withdrawal_method" description:"提现方式 (alipay:支付宝, wechat:微信, bank:银行卡)"`
+	PaymentType      string `json:"payment_type" description:"放款类型 (manual:人工打款)"`
+	AccountName      string `json:"account_name" description:"收款账户名称"`
+	AccountNumber    string `json:"account_number" description:"收款账号"`
+	BankName         string `json:"bank_name,omitempty" description:"银行名称"`
+	RejectReason     string `json:"reject_reason,omitempty" description:"拒绝原因"`
+	Remark           string `json:"remark,omitempty" description:"备注"`
+	CreatedAt        string `json:"created_at" description:"申请时间"`
+	ProcessedAt      string `json:"processed_at,omitempty" description:"处理时间"`
+}
+
+// WithdrawalRequestPageResult 提现申请列表分页响应
+type WithdrawalRequestPageResult struct {
+	Items []WithdrawalRequestItem `json:"items" description:"提现申请列表"`
+	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"`
+}
+
+// ApproveWithdrawalReq 审批通过提现申请请求
+type ApproveWithdrawalReq struct {
+	ID               uint    `json:"-" params:"id" path:"id" validate:"required" description:"提现申请ID"`
+	PaymentType      string  `json:"payment_type" validate:"required,oneof=manual" required:"true" description:"放款类型（目前只支持manual人工打款）"`
+	Amount           *int64  `json:"amount" validate:"omitempty,min=1" minimum:"1" description:"修正后的提现金额（分），不填则使用原金额"`
+	WithdrawalMethod *string `json:"withdrawal_method" validate:"omitempty,oneof=alipay wechat bank" description:"修正后的收款类型 (alipay:支付宝, wechat:微信, bank:银行卡)"`
+	AccountName      *string `json:"account_name" validate:"omitempty,max=100" maxLength:"100" description:"修正后的收款人姓名"`
+	AccountNumber    *string `json:"account_number" validate:"omitempty,max=100" maxLength:"100" description:"修正后的收款账号"`
+	Remark           string  `json:"remark" validate:"omitempty,max=500" maxLength:"500" description:"备注"`
+}
+
+// RejectWithdrawalReq 拒绝提现申请请求
+type RejectWithdrawalReq struct {
+	ID     uint   `json:"-" params:"id" path:"id" validate:"required" description:"提现申请ID"`
+	Remark string `json:"remark" validate:"required,max=500" required:"true" maxLength:"500" description:"拒绝原因（必填）"`
+}
+
+// WithdrawalApprovalResp 审批响应
+type WithdrawalApprovalResp struct {
+	ID           uint   `json:"id" description:"提现申请ID"`
+	WithdrawalNo string `json:"withdrawal_no" description:"提现单号"`
+	Status       int    `json:"status" description:"状态 (1:待审核, 2:已通过, 3:已拒绝, 4:已到账)"`
+	StatusName   string `json:"status_name" description:"状态名称"`
+	ProcessedAt  string `json:"processed_at" description:"处理时间"`
+}