feat(api): Implement API response Cache-Control

- Introduce `withCacheControl` utility function for API responses.
- Apply `private, no-store` to authentication and data modification (POST, PATCH, DELETE) routes.
- Apply `private, no-cache` to sensitive data retrieval (GET) routes.
- Enhance security by preventing caching of private user data.
- Ensure fresh data is always fetched for authenticated API responses.

lib/api-response.ts

@@ -126,6 +126,11 @@ export function successResponse<T>(
   return NextResponse.json(body, { status });
 }
 
+export function withCacheControl<T>(response: NextResponse<T>, value: string): NextResponse<T> {
+  response.headers.set('Cache-Control', value);
+  return response;
+}
+
 /**
  * Common error response helpers
  */