fix: use warning level for push metrics log

src/Controllers/ApiController.php

@@ -304,7 +304,7 @@ class ApiController
         $input = json_decode($rawBody, true);
 
         $logger = \ServerManager\Core\Logger::getInstance();
-        $logger->info('Push metrics received', [
+        $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',