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/account_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // CreateAccountRequest 创建账号请求
 type CreateAccountRequest struct {

internal/model/dto/account_role_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // AccountRoleResponse 账号-角色关联响应
 type AccountRoleResponse struct {

internal/model/dto/auth_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type LoginRequest struct {
 	Username string `json:"username" validate:"required"`

internal/model/dto/commission_withdrawal_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // WithdrawalRequestListReq 提现申请列表查询请求
 type WithdrawalRequestListReq struct {

internal/model/dto/commission_withdrawal_setting_dto.go

@@ -1,4 +1,4 @@
-package model
+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"`

internal/model/dto/common.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // IDReq 通用 ID 路径参数请求
 type IDReq struct {

internal/model/dto/customer_account_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type CustomerAccountListReq struct {
 	Page         int    `json:"page" query:"page" validate:"omitempty,min=1" minimum:"1" description:"页码"`

internal/model/dto/enterprise_card_authorization_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type AllocateCardsPreviewReq struct {
 	ID     uint     `json:"-" params:"id" path:"id" validate:"required" required:"true" description:"企业ID"`

internal/model/dto/enterprise_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type CreateEnterpriseReq struct {
 	EnterpriseName  string `json:"enterprise_name" validate:"required,max=100" required:"true" maximum:"100" description:"企业名称"`

internal/model/dto/my_commission_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type MyCommissionSummaryResp struct {
 	ShopID                uint   `json:"shop_id" description:"店铺ID"`

internal/model/dto/permission_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // CreatePermissionRequest 创建权限请求
 type CreatePermissionRequest struct {

internal/model/dto/personal_customer_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // CreatePersonalCustomerRequest 创建个人客户请求
 type CreatePersonalCustomerRequest struct {

internal/model/dto/role_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // CreateRoleRequest 创建角色请求
 type CreateRoleRequest struct {

internal/model/dto/role_permission_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // RolePermissionResponse 角色-权限关联响应
 type RolePermissionResponse struct {

internal/model/dto/shop_account_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // ShopAccountListRequest 代理商账号列表查询请求
 type ShopAccountListRequest struct {

internal/model/dto/shop_commission_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 // ========================================
 // 代理商佣金查询 DTO

internal/model/dto/shop_dto.go

@@ -1,4 +1,4 @@
-package model
+package dto
 
 type ShopListRequest struct {
 	Page     int    `json:"page" query:"page" validate:"omitempty,min=1" minimum:"1" description:"页码"`