feat: implement prerequisite validation and installation for server setup

app/Actions/Server/ValidatePrerequisites.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Actions\Server;
+
+use App\Models\Server;
+use Lorisleiva\Actions\Concerns\AsAction;
+
+class ValidatePrerequisites
+{
+    use AsAction;
+
+    public string $jobQueue = 'high';
+
+    public function handle(Server $server): bool
+    {
+        $requiredCommands = ['git', 'curl', 'jq'];
+
+        foreach ($requiredCommands as $cmd) {
+            $found = instant_remote_process(["command -v {$cmd}"], $server, false);
+            if (! $found) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}