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.

tests/Feature/ServerBuildRoleHelperTest.php

@@ -0,0 +1,9 @@
+<?php
+
+test('server settings explain dedicated build server mode', function () {
+    $view = file_get_contents(resource_path('views/livewire/server/show.blade.php'));
+
+    expect($view)
+        ->toContain('label="Use as a dedicated build server"')
+        ->toContain('helper="Build servers compile applications but do not host deployments. Enabling this makes the server build-only."');
+});