feat(server): auto-resolve Sentinel URL and polish setup UI

Ensure a Sentinel endpoint from instance FQDN/IP when enabling, use process dialogs for validation with install state, and tidy server create, boarding, metrics empty state, and log timestamps.

bootstrap/helpers/remoteProcess.php

@@ -253,7 +253,7 @@ function decode_remote_command_output(?ApplicationDeploymentQueue $application_d
             } catch (Exception) {
                 $timestamp->setTimezone('UTC');
             }
-            data_set($i, 'timestamp', $timestamp->format('Y-M-d H:i:s.u'));
+            data_set($i, 'timestamp', $timestamp->format('Y-M-d H:i:s'));
 
             return $i;
         })