fix: missing 422 error code in openapi spec

app/Http/Controllers/Api/OpenApi.php

@@ -40,6 +40,27 @@ use OpenApi\Attributes as OA;
                     new OA\Property(property: 'message', type: 'string', example: 'Resource not found.'),
                 ]
             )),
+        new OA\Response(
+            response: 422,
+            description: 'Validation error.',
+            content: new OA\JsonContent(
+                type: 'object',
+                properties: [
+                    new OA\Property(property: 'message', type: 'string', example: 'Validation error.'),
+                    new OA\Property(
+                        property: 'errors',
+                        type: 'object',
+                        additionalProperties: new OA\AdditionalProperties(
+                            type: 'array',
+                            items: new OA\Items(type: 'string')
+                        ),
+                        example: [
+                            'name' => ['The name field is required.'],
+                            'api_url' => ['The api url field is required.', 'The api url format is invalid.'],
+                        ]
+                    ),
+                ]
+            )),
     ],
 )]
 class OpenApi