fix: Fix docker examples

- Moved `httpconnection` import from `clients` to `core`.
- Changed `tfgrid-sdk-ts` dashboard to playground.
- Added ipaddr to node_local().
- Added public keyword to OpenSSLGenerateArgs.
- Improved DockerEngine image and container loading.
- Added utils.contains_ssh_port.
- Improved error handling in DockerEngine.
- Improved Docker registry handling.

Co-authored-by: mariobassem12 <mariobassem12@gmail.com>
Co-authored-by: omda <mahmmoud.hassanein@gmail.com>

examples/core/openapi/gitea/gitea_client/factory.v

@@ -1,7 +1,7 @@
 module dagu
 
 // import os
-import freeflowuniverse.herolib.clients.httpconnection
+import freeflowuniverse.herolib.core.httpconnection
 import os
 
 struct GiteaClient[T] {