fix: force LC_ALL=C for metric commands to avoid comma decimal separator

Some locales use comma as decimal separator (e.g., es_DO.UTF-8).
This caused invalid JSON like "cpu": 2,4 instead of "cpu": 2.4.
Prefixed CPU and RAM commands with LC_ALL=C to force dot decimals.

Also removed debug logging from pushMetrics endpoint.

src/Controllers/ApiController.php

@@ -303,14 +303,6 @@ class ApiController
         $rawBody = file_get_contents('php://input');
         $input = json_decode($rawBody, true);
 
-        $logger = \ServerManager\Core\Logger::getInstance();
-        $logger->warning('Push metrics received', [
-            'input_keys' => $input ? array_keys($input) : [],
-            'has_agent_key' => !empty($input['agent_key']),
-            'agent_key_prefix' => isset($input['agent_key']) ? substr((string)$input['agent_key'], 0, 8) . '...' : 'none',
-            'raw_body_prefix' => substr($rawBody, 0, 200),
-        ]);
-
         if (!$input || empty($input['agent_key'])) {
             $this->view->json(['error' => 'agent_key is required'], 401);
         }