[italovalcy]

Fixes #324

Changes

• create_lab error logs (manifest parse failure and resource creation failure) now include lab_id and user_uid.
• The Lab edit form validates the manifest syntax on save (yaml.compose_all, syntax only). Invalid YAML is rejected, the submitted form values are kept, and the message includes the line and column.
• Added a test and a changelog entry.

Notes

• Only the Lab edit form is validated. Other paths that store manifests, and Labs already saved with an invalid manifest, are not covered.
• The new message is not yet in the pt_BR catalog.

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