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/permission.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"
 )
 
@@ -17,16 +17,16 @@ func registerPermissionRoutes(api fiber.Router, h *admin.PermissionHandler, doc
 	Register(permissions, doc, groupPath, "POST", "", h.Create, RouteSpec{
 		Summary: "创建权限",
 		Tags:    []string{"权限"},
-		Input:   new(model.CreatePermissionRequest),
-		Output:  new(model.PermissionResponse),
+		Input:   new(dto.CreatePermissionRequest),
+		Output:  new(dto.PermissionResponse),
 		Auth:    true,
 	})
 
 	Register(permissions, doc, groupPath, "GET", "", h.List, RouteSpec{
 		Summary: "权限列表",
 		Tags:    []string{"权限"},
-		Input:   new(model.PermissionListRequest),
-		Output:  new(model.PermissionPageResult),
+		Input:   new(dto.PermissionListRequest),
+		Output:  new(dto.PermissionPageResult),
 		Auth:    true,
 	})
 
@@ -34,30 +34,30 @@ func registerPermissionRoutes(api fiber.Router, h *admin.PermissionHandler, doc
 		Summary: "获取权限树",
 		Tags:    []string{"权限"},
 		Input:   nil, // 无参数或 Query 参数
-		Output:  new([]*model.PermissionTreeNode),
+		Output:  new([]*dto.PermissionTreeNode),
 		Auth:    true,
 	})
 
 	Register(permissions, doc, groupPath, "GET", "/:id", h.Get, RouteSpec{
 		Summary: "获取权限详情",
 		Tags:    []string{"权限"},
-		Input:   new(model.IDReq),
-		Output:  new(model.PermissionResponse),
+		Input:   new(dto.IDReq),
+		Output:  new(dto.PermissionResponse),
 		Auth:    true,
 	})
 
 	Register(permissions, doc, groupPath, "PUT", "/:id", h.Update, RouteSpec{
 		Summary: "更新权限",
 		Tags:    []string{"权限"},
-		Input:   new(model.UpdatePermissionParams),
-		Output:  new(model.PermissionResponse),
+		Input:   new(dto.UpdatePermissionParams),
+		Output:  new(dto.PermissionResponse),
 		Auth:    true,
 	})
 
 	Register(permissions, doc, groupPath, "DELETE", "/:id", h.Delete, RouteSpec{
 		Summary: "删除权限",
 		Tags:    []string{"权限"},
-		Input:   new(model.IDReq),
+		Input:   new(dto.IDReq),
 		Output:  nil,
 		Auth:    true,
 	})