Add autogenerate_domain API parameter for applications

Allows API consumers to control domain auto-generation behavior. When autogenerate_domain is true (default) and no custom domains are provided, the system auto-generates a domain using the server's wildcard domain or sslip.io fallback.

- Add autogenerate_domain parameter to all 5 application creation endpoints
- Add validation and allowlist rules
- Implement domain auto-generation logic across all application types
- Add comprehensive unit tests for the feature

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

bootstrap/helpers/api.php

@@ -178,4 +178,5 @@ function removeUnnecessaryFieldsFromRequest(Request $request)
     $request->offsetUnset('use_build_server');
     $request->offsetUnset('is_static');
     $request->offsetUnset('force_domain_override');
+    $request->offsetUnset('autogenerate_domain');
 }