feat(cdn): sync release metadata through BunnyCDN

Replace the legacy sync:bunny flags with an interactive CDN sync flow for service templates and release metadata. Serve official service templates from the Coollabs CDN, update version metadata, and remove obsolete helper scripts.

tests/Unit/DeploymentConfiguration/ApplicationConfigurationSnapshotTest.php

@@ -66,12 +66,16 @@ it('detects redeploy-only domain changes', function () {
     $application = snapshotTestApplication();
     markSnapshotTestApplicationDeployed($application);
 
-    $application->update(['fqdn' => 'https://new.example.com']);
+    $domains = 'https://new.example.com,https://another.example.com';
+    $application->update(['fqdn' => $domains]);
     $diff = $application->refresh()->pendingDeploymentConfigurationDiff();
+    $change = collect($diff->changes())->firstWhere('label', 'Domains');
 
     expect($diff->isChanged())->toBeTrue()
         ->and($diff->requiresBuild())->toBeFalse()
-        ->and(collect($diff->changes())->pluck('label'))->toContain('Domains');
+        ->and($change)->not->toBeNull()
+        ->and($change['expandable'])->toBeTrue()
+        ->and($change['new_full_value'])->toBe($domains);
 });
 
 it('detects environment variable value changes without exposing secret values', function () {