chore: pre-release cleanup

- Skip token clear/redirect on 401 for unauthenticated requests
- Fix typo in test secret key in restart-backend script
- Remove completed plan documents (entity-relationship-refactor, ux-notification-improvements)

frontend/src/lib/api.ts

@@ -94,7 +94,7 @@ export async function api<T = any>(
 			}
 		}
 
-		if (res.status === 401) {
+		if (res.status === 401 && token) {
 			clearTokens();
 			if (typeof window !== 'undefined') {
 				window.location.href = '/login';