fix(admin): repair class, role, and room views

Use the RBAC user endpoint for teacher selection, restore role table columns, correct Ant Design props, and add typed room bed and locker responses.

apps/admin/src/pages/Classes/index.tsx

@@ -42,11 +42,6 @@ interface ClassFormValues {
   notes?: string;
 }
 
-interface ClassQueryParams {
-  status?: string;
-  classType?: string;
-}
-
 // ---- Constants ----
 
 const STATUS_MAP: Record<string, { color: string; text: string }> = {