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/service/permission/service.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/internal/model/dto"
 	"github.com/break/junhong_cmp_fiber/internal/store"
 	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
@@ -46,7 +47,7 @@ func New(
 }
 
 // Create 创建权限
-func (s *Service) Create(ctx context.Context, req *model.CreatePermissionRequest) (*model.Permission, error) {
+func (s *Service) Create(ctx context.Context, req *dto.CreatePermissionRequest) (*model.Permission, error) {
 	// 获取当前用户 ID
 	currentUserID := middleware.GetUserIDFromContext(ctx)
 	if currentUserID == 0 {
@@ -109,7 +110,7 @@ func (s *Service) Get(ctx context.Context, id uint) (*model.Permission, error) {
 }
 
 // Update 更新权限
-func (s *Service) Update(ctx context.Context, id uint, req *model.UpdatePermissionRequest) (*model.Permission, error) {
+func (s *Service) Update(ctx context.Context, id uint, req *dto.UpdatePermissionRequest) (*model.Permission, error) {
 	// 获取当前用户 ID
 	currentUserID := middleware.GetUserIDFromContext(ctx)
 	if currentUserID == 0 {
@@ -190,7 +191,7 @@ func (s *Service) Delete(ctx context.Context, id uint) error {
 }
 
 // List 查询权限列表
-func (s *Service) List(ctx context.Context, req *model.PermissionListRequest) ([]*model.Permission, int64, error) {
+func (s *Service) List(ctx context.Context, req *dto.PermissionListRequest) ([]*model.Permission, int64, error) {
 	opts := &store.QueryOptions{
 		Page:     req.Page,
 		PageSize: req.PageSize,
@@ -230,7 +231,7 @@ func (s *Service) List(ctx context.Context, req *model.PermissionListRequest) ([
 }
 
 // GetTree 获取权限树
-func (s *Service) GetTree(ctx context.Context, availableForRoleType *int) ([]*model.PermissionTreeNode, error) {
+func (s *Service) GetTree(ctx context.Context, availableForRoleType *int) ([]*dto.PermissionTreeNode, error) {
 	permissions, err := s.permissionStore.GetAll(ctx, availableForRoleType)
 	if err != nil {
 		return nil, fmt.Errorf("获取权限列表失败: %w", err)
@@ -240,10 +241,10 @@ func (s *Service) GetTree(ctx context.Context, availableForRoleType *int) ([]*mo
 }
 
 // buildPermissionTree 构建权限树
-func buildPermissionTree(permissions []*model.Permission) []*model.PermissionTreeNode {
-	nodeMap := make(map[uint]*model.PermissionTreeNode)
+func buildPermissionTree(permissions []*model.Permission) []*dto.PermissionTreeNode {
+	nodeMap := make(map[uint]*dto.PermissionTreeNode)
 	for _, p := range permissions {
-		nodeMap[p.ID] = &model.PermissionTreeNode{
+		nodeMap[p.ID] = &dto.PermissionTreeNode{
 			ID:                    p.ID,
 			PermName:              p.PermName,
 			PermCode:              p.PermCode,
@@ -252,11 +253,11 @@ func buildPermissionTree(permissions []*model.Permission) []*model.PermissionTre
 			AvailableForRoleTypes: p.AvailableForRoleTypes,
 			URL:                   p.URL,
 			Sort:                  p.Sort,
-			Children:              make([]*model.PermissionTreeNode, 0),
+			Children:              make([]*dto.PermissionTreeNode, 0),
 		}
 	}
 
-	var roots []*model.PermissionTreeNode
+	var roots []*dto.PermissionTreeNode
 	for _, p := range permissions {
 		node := nodeMap[p.ID]
 		if p.ParentID == nil || *p.ParentID == 0 {