feat(exception): ✨ ApiException新增預設錯誤訊息常數

Author: hankz1108

src/Exceptions/ApiException.php

@@ -11,10 +11,15 @@
 
 abstract class ApiException extends Exception implements HttpExceptionInterface
 {
+    // return api code, override if needed
     public const API_CODE = Response::HTTP_INTERNAL_SERVER_ERROR;
 
+    // return http code, override if needed
     public const HTTP_CODE = Response::HTTP_INTERNAL_SERVER_ERROR;
 
+    // return message, override if needed
+    public const API_MESSAGE = '';
+
     /**
      * message.
      *
@@ -33,13 +38,9 @@ public function __construct(string $message = null, $data = null)
     {
         parent::__construct($message);
 
-        if (!is_null($message)) {
-            $this->message = $message;
-        }
+        $this->message = $message ?? static::API_MESSAGE;
 
-        if (!is_null($data)) {
-            $this->data = $data;
-        }
+        $this->data = $data;
     }
 
     /**