chore: clean up lint/type issues and tighten comment media URL validation

lib/api-response.ts

@@ -126,7 +126,7 @@ export function successResponse<T>(
   return NextResponse.json(body, { status });
 }
 
-export function withCacheControl<T>(response: Response, value: string): Response {
+export function withCacheControl(response: Response, value: string): Response {
   response.headers.set('Cache-Control', value);
   return response;
 }