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/routes/customer_account.go

@@ -4,7 +4,7 @@ import (
 	"github.com/gofiber/fiber/v2"
 
 	"github.com/break/junhong_cmp_fiber/internal/handler/admin"
-	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/internal/model/dto"
 	"github.com/break/junhong_cmp_fiber/pkg/openapi"
 )
 
@@ -15,31 +15,31 @@ func registerCustomerAccountRoutes(router fiber.Router, handler *admin.CustomerA
 	Register(accounts, doc, groupPath, "GET", "", handler.List, RouteSpec{
 		Summary: "客户账号列表",
 		Tags:    []string{"客户账号管理"},
-		Input:   new(model.CustomerAccountListReq),
-		Output:  new(model.CustomerAccountPageResult),
+		Input:   new(dto.CustomerAccountListReq),
+		Output:  new(dto.CustomerAccountPageResult),
 		Auth:    true,
 	})
 
 	Register(accounts, doc, groupPath, "POST", "", handler.Create, RouteSpec{
 		Summary: "新增代理商账号",
 		Tags:    []string{"客户账号管理"},
-		Input:   new(model.CreateCustomerAccountReq),
-		Output:  new(model.CustomerAccountItem),
+		Input:   new(dto.CreateCustomerAccountReq),
+		Output:  new(dto.CustomerAccountItem),
 		Auth:    true,
 	})
 
 	Register(accounts, doc, groupPath, "PUT", "/:id", handler.Update, RouteSpec{
 		Summary: "编辑账号",
 		Tags:    []string{"客户账号管理"},
-		Input:   new(model.UpdateCustomerAccountReq),
-		Output:  new(model.CustomerAccountItem),
+		Input:   new(dto.UpdateCustomerAccountReq),
+		Output:  new(dto.CustomerAccountItem),
 		Auth:    true,
 	})
 
 	Register(accounts, doc, groupPath, "PUT", "/:id/password", handler.UpdatePassword, RouteSpec{
 		Summary: "修改账号密码",
 		Tags:    []string{"客户账号管理"},
-		Input:   new(model.UpdateCustomerAccountPasswordReq),
+		Input:   new(dto.UpdateCustomerAccountPasswordReq),
 		Output:  nil,
 		Auth:    true,
 	})
@@ -47,7 +47,7 @@ func registerCustomerAccountRoutes(router fiber.Router, handler *admin.CustomerA
 	Register(accounts, doc, groupPath, "PUT", "/:id/status", handler.UpdateStatus, RouteSpec{
 		Summary: "修改账号状态",
 		Tags:    []string{"客户账号管理"},
-		Input:   new(model.UpdateCustomerAccountStatusReq),
+		Input:   new(dto.UpdateCustomerAccountStatusReq),
 		Output:  nil,
 		Auth:    true,
 	})