feat: v1.6.0 — fix service 500, search bar, modal redesign

- Fix 500 error: cast to string before preg_replace
- Search bar to filter services by name/description
- Redesigned service action modal with status badge + colored buttons
- Version 1.6.0

src/Controllers/ApiController.php

@@ -659,15 +659,18 @@ class ApiController
         }
 
         $input = json_decode(file_get_contents('php://input'), true) ?? $_POST;
-        $service = $input['service'] ?? '';
-        $action = $input['action'] ?? '';
+        $service = (string) ($input['service'] ?? '');
+        $action = (string) ($input['action'] ?? '');
         $allowed = ['start', 'stop', 'restart', 'reload'];
 
-        if (empty($service) || !in_array($action, $allowed, true)) {
+        if ($service === '' || !in_array($action, $allowed, true)) {
             $this->view->json(['error' => 'Invalid service or action'], 400);
         }
 
         $sanitized = preg_replace('/[^a-zA-Z0-9\-_]/', '', $service);
+        if ($sanitized === '') {
+            $this->view->json(['error' => 'Invalid service name'], 400);
+        }
 
         try {
             $ssh = new SSHService();
@@ -678,7 +681,7 @@ class ApiController
             $result = $ssh->exec("sudo systemctl {$action} {$sanitized} 2>&1");
             $ssh->disconnect();
 
-            $exitCode = (int) ($result['exit_status'] ?? -1);
+            $exitCode = isset($result['exit_status']) ? (int) $result['exit_status'] : -1;
 
             $auditService = new AuditService();
             $auditService->logServerAction($id, "service_{$action}", "{$sanitized} {$action}");
@@ -694,7 +697,7 @@ class ApiController
             } else {
                 $this->view->json([
                     'success' => false,
-                    'error' => "Failed to {$action} '{$sanitized}'.",
+                    'error' => "Failed to {$action} '{$sanitized}'. Exit code: {$exitCode}",
                     'data' => ['output' => trim($result['output'] ?? '')],
                 ], 500);
             }