feat(sentinel): track synchronization state and refresh status UI

Add sentinel waiting-state tracking, synchronization broadcasts, and restore
status handling across server and application interfaces.

tests/Unit/StartSentinelEndpointFallbackTest.php

@@ -21,3 +21,13 @@ test('sentinel startup allows legacy metrics migrations to finish before health
 
     expect($action)->toContain('--health-start-period 120s');
 });
+
+test('local sentinel joins the Coolify network and waits for an authenticated push before becoming live', function () {
+    $action = file_get_contents(dirname(__DIR__, 2).'/app/Actions/Server/StartSentinel.php');
+
+    expect($action)
+        ->toContain('--network coolify')
+        ->toContain('sentinelHeartbeat(isReset: true)')
+        ->toContain("sentinel_waiting_since' => now()")
+        ->not->toContain('$server->sentinelHeartbeat();');
+});