Refactor Server model to remove SSH multiplexing file and add ServerCleanupMux job

- Remove SSH multiplexing file from the Server model
- Add ServerCleanupMux job to cleanup multiplexed connections every hour

app/Console/Kernel.php

@@ -12,6 +12,7 @@ use App\Jobs\DockerCleanupJob;
 use App\Jobs\PullTemplatesFromCDN;
 use App\Jobs\ScheduledTaskJob;
 use App\Jobs\ServerCheckJob;
+use App\Jobs\ServerCleanupMux;
 use App\Jobs\UpdateCoolifyJob;
 use App\Models\ScheduledDatabaseBackup;
 use App\Models\ScheduledTask;
@@ -120,6 +121,8 @@ class Kernel extends ConsoleKernel
             } else {
                 $schedule->job(new DockerCleanupJob($server))->everyTenMinutes()->timezone($serverTimezone)->onOneServer();
             }
+            // Cleanup multiplexed connections every hour
+            $schedule->job(new ServerCleanupMux($server))->hourly()->onOneServer();
 
             // Temporary solution until we have better memory management for Sentinel
             if ($server->isSentinelEnabled()) {