feat(types): add image types and enhance Post/Comment interfaces

Add PostImage and CommentImage types for handling post/comment images. Update
Post interface with likes_count, comments_count, views_count, and images.
Update Comment interface with likes_count, replies_count, and images. Add
display_name and priority to Role type. Include dynamic color CSS utilities
and UI enhancements for Comments/Posts pages. Add defensive empty array
fallback for subjects data.

src/pages/Users.tsx

@@ -105,10 +105,12 @@ export default function Users() {
       const response = await rolesApi.getRoles()
       const roles = response.data.data || []
       setAllRoles(roles.map(r => ({
-        id: r.name, // 使用 name 作为 id
+        id: r.name,
         name: r.name,
+        display_name: r.display_name,
         description: r.description,
-        created_at: '', // 后端列表接口不返回这些字段
+        priority: r.priority,
+        created_at: '',
         updated_at: '',
       })))
     } catch (error) {