fix(smart-proxy): start metrics polling before certificate provisioning to avoid blocking metrics collection

ts/proxies/smart-proxy/smart-proxy.ts

@@ -191,13 +191,16 @@ export class SmartProxy extends plugins.EventEmitter {
       }
     }
 
-    // Handle certProvisionFunction
-    await this.provisionCertificatesViaCallback(preloadedDomains);
-
-    // Start metrics polling
+    // Start metrics polling BEFORE cert provisioning — the Rust engine is already
+    // running and accepting connections, so metrics should be available immediately.
+    // Cert provisioning can hang indefinitely (e.g. DNS-01 ACME timeouts) and must
+    // not block metrics collection.
     this.metricsAdapter.startPolling();
 
     logger.log('info', 'SmartProxy started (Rust engine)', { component: 'smart-proxy' });
+
+    // Handle certProvisionFunction (may be slow — runs after startup is complete)
+    await this.provisionCertificatesViaCallback(preloadedDomains);
   }
 
   /**