fix(ApiResponse): set Accept and Content-Type headers to application/json (#50)

Fixes that the API responses were missing the necessary headers. This
ensures that the `Accept` and `Content-Type` headers are correctly set
to `application/json` for improved compatibility and adherence to best
practices in API development.

Signed-off-by: Valentin Sickert <[email protected]>

Author: Lapotor

app/Http/Responses/ApiErrorResponse.php

@@ -18,7 +18,7 @@ public function __construct(
         private $message,
         private ?Throwable $exception = null,
         private int $status = Response::HTTP_INTERNAL_SERVER_ERROR,
-        private array $headers = []
+        private array $headers = ["Content-Type" => "application/json", "Accept" => "application/json"]
     ) {}
 
     /**

app/Http/Responses/ApiSuccessResponse.php

@@ -16,7 +16,7 @@ class ApiSuccessResponse implements Responsable
     public function __construct(
         private $data,
         private int $status = Response::HTTP_OK,
-        private array $headers = []
+        private array $headers = ["Content-Type" => "application/json", "Accept" => "application/json"]
     ) {}
 
     /**