fix(upgrade): use authenticated status polling after restart

Remove the version header from the health endpoint and use upgrade status polling to determine completion.

tests/Feature/HealthcheckVersionHeaderTest.php

@@ -3,20 +3,20 @@
 use App\Http\Controllers\Api\OtherController;
 use Illuminate\Http\Request;
 
-it('adds the running version header on the healthcheck response', function () {
+it('does not expose the running version on the healthcheck response', function () {
     config(['constants.coolify.version' => '4.3.1']);
 
     $response = (new OtherController)->healthcheck(Request::create('/api/health', 'GET'));
 
     expect($response->getContent())->toBe('OK')
-        ->and($response->headers->get('X-Coolify-Version'))->toBe('4.3.1');
+        ->and($response->headers->has('X-Coolify-Version'))->toBeFalse();
 });
 
-it('exposes the running Coolify version on the public health endpoint', function () {
+it('does not expose the running Coolify version on the public health endpoint', function () {
     config(['constants.coolify.version' => '4.3.1']);
 
     $this->get('/api/health')
         ->assertSuccessful()
         ->assertSee('OK')
-        ->assertHeader('X-Coolify-Version', '4.3.1');
+        ->assertHeaderMissing('X-Coolify-Version');
 });