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

tests/integration/permission_test.go

@@ -24,6 +24,7 @@ import (
 	"github.com/break/junhong_cmp_fiber/internal/bootstrap"
 	"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/internal/routes"
 	permissionService "github.com/break/junhong_cmp_fiber/internal/service/permission"
 	postgresStore "github.com/break/junhong_cmp_fiber/internal/store/postgres"
@@ -148,7 +149,7 @@ func TestPermissionAPI_Create(t *testing.T) {
 	})
 
 	t.Run("成功创建权限", func(t *testing.T) {
-		reqBody := model.CreatePermissionRequest{
+		reqBody := dto.CreatePermissionRequest{
 			PermName: "用户管理",
 			PermCode: "user:manage",
 			PermType: constants.PermissionTypeMenu,
@@ -185,7 +186,7 @@ func TestPermissionAPI_Create(t *testing.T) {
 		env.db.Create(existingPerm)
 
 		// 尝试创建相同编码的权限
-		reqBody := model.CreatePermissionRequest{
+		reqBody := dto.CreatePermissionRequest{
 			PermName: "新权限",
 			PermCode: "existing:perm",
 			PermType: constants.PermissionTypeMenu,
@@ -215,7 +216,7 @@ func TestPermissionAPI_Create(t *testing.T) {
 		env.db.Create(parentPerm)
 
 		// 创建子权限
-		reqBody := model.CreatePermissionRequest{
+		reqBody := dto.CreatePermissionRequest{
 			PermName: "用户列表",
 			PermCode: "system:user:list",
 			PermType: constants.PermissionTypeButton,
@@ -308,7 +309,7 @@ func TestPermissionAPI_Update(t *testing.T) {
 
 	t.Run("成功更新权限", func(t *testing.T) {
 		newName := "更新后权限"
-		reqBody := model.UpdatePermissionRequest{
+		reqBody := dto.UpdatePermissionRequest{
 			PermName: &newName,
 		}