feat: add mx login mode selection

exec/lib/RemoteLoginUrlClient.php

@@ -44,7 +44,7 @@ final class RemoteLoginUrlClient
      */
     public static function buildCommand(Settings $settings, LoginUrlRequest $request): array
     {
-        return [
+        $base = [
             'ssh',
             '-o',
             'BatchMode=yes',
@@ -59,6 +59,23 @@ final class RemoteLoginUrlClient
             '-p',
             (string)$settings->sshPort(),
             $settings->sshUser() . '@' . $settings->sshHost(),
+        ];
+
+        if ($settings->mxLoginMode() === 1) {
+            $command = array_merge($base, [
+                '/usr/bin/da',
+                'login-url',
+                '--user=' . $request->username,
+                '--redirect-url=' . $request->redirectPath,
+                '--expiry=' . $request->ttl . 's',
+            ]);
+            if ($request->userIpBound) {
+                $command[] = '--ip=' . $request->clientIp;
+            }
+            return $command;
+        }
+
+        return array_merge($base, [
             'mail-login-create-url',
             $request->username,
             $request->sourceHost,
@@ -68,7 +85,7 @@ final class RemoteLoginUrlClient
             $request->clientIp,
             $request->redirectPath,
             (string)$request->createdAt,
-        ];
+        ]);
     }
 
     public function create(Settings $settings, LoginUrlRequest $request): string