feat: add exception handling for MethodArgumentNotValidException and update UtmModuleConfigValidator logic

Author: mjabascal10

backend/src/main/java/com/park/utmstack/advice/GlobalExceptionHandler.java

@@ -10,6 +10,7 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
@@ -60,6 +61,11 @@ public ResponseEntity<?> handleConflict(Exception e, HttpServletRequest request)
         return ResponseUtil.buildErrorResponse(HttpStatus.CONFLICT, e.getMessage());
     }
 
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<?> handleMethodArgumentNotValid(MethodArgumentNotValidException e, HttpServletRequest request) {
+        return ResponseUtil.buildBadRequestResponse(e.getBindingResult().getAllErrors().get(0).getDefaultMessage());
+    }
+
     @ExceptionHandler(Exception.class)
     public ResponseEntity<?> handleGenericException(Exception e, HttpServletRequest request) {
         return ResponseUtil.buildInternalServerErrorResponse(e.getMessage());

backend/src/main/java/com/park/utmstack/domain/application_modules/validators/UtmModuleConfigValidator.java

@@ -34,7 +34,7 @@ public boolean validate(UtmModule module, List<UtmModuleGroupConfiguration> keys
 
                     return new UtmModuleGroupConfDTO(
                             source.getConfKey(),
-                            decryptIfNeeded(source.getConfDataType(), source.getConfValue())
+                            override != null ? source.getConfValue() : decryptIfNeeded(source.getConfDataType(), source.getConfValue())
                     );
                 })
                 .toList();