fix(model): add guarded

src/Models/AccessToken.php

@@ -15,4 +15,5 @@ use Flarum\Database\AbstractModel;
 class AccessToken extends AbstractModel
 {
     protected $table = 'oauth_access_tokens';
+    protected $guarded = [];
 }

src/Models/AuthorizationCode.php

@@ -15,4 +15,5 @@ use Flarum\Database\AbstractModel;
 class AuthorizationCode extends AbstractModel
 {
     protected $table = 'oauth_authorization_codes';
+    protected $guarded = [];
 }

src/Models/Client.php

@@ -15,7 +15,6 @@ use Flarum\Database\AbstractModel;
 class Client extends AbstractModel
 {
     protected $table = 'oauth_clients';
-
     protected $guarded = [];
 
     public static function build(string $client_id, string $client_secret, int $user_id)

src/Models/Jwt.php

@@ -15,4 +15,5 @@ use Flarum\Database\AbstractModel;
 class Jwt extends AbstractModel
 {
     protected $table = 'oauth_jwt';
+    protected $guarded = [];
 }

src/Models/RefreshToken.php

@@ -15,4 +15,5 @@ use Flarum\Database\AbstractModel;
 class RefreshToken extends AbstractModel
 {
     protected $table = 'oauth_refresh_tokens';
+    protected $guarded = [];
 }

src/Models/Scope.php

@@ -15,7 +15,7 @@ use Flarum\Database\AbstractModel;
 class Scope extends AbstractModel
 {
     protected $table = 'oauth_scopes';
-
+    protected $guarded = [];
     static public function get_path_scope($path = '')
     {
         return self::where('resource_path', 'like', $path . '%')->first();