fix alive response

src/main/java/ru/ulstu/controller/UtilController.java

@@ -25,8 +25,8 @@ public class UtilController {
 
     @GetMapping("alive")
     @Operation(description = "Проверка сервиса")
-    public ResponseEntity<Boolean> isAlive() {
+    public ResponseEntity<Map<String, Boolean> isAlive() {
-        return new ResponseEntity<>(true, HttpStatus.OK);
+        return new ResponseEntity<>(Map.of("result", true), HttpStatus.OK);
     }
 
     @GetMapping("getRandom")