Enable `HasFactory` on `Environment`, `Project`, `ScheduledTask`, and
`StandaloneDocker`, and add dedicated factories for related models to
stabilize feature/unit tests.
Also bump `visus/cuid2` to `^6.0` and refresh `composer.lock` with the
resulting dependency updates.
- Add regex validation to restrict allowed characters (alphanumeric, spaces, and specific safe symbols)
- Enforce maximum 1000 character limit on healthcheck commands
- Strip newlines and carriage returns to prevent command injection
- Change input field from textarea to text input in UI
- Add warning callout about prohibited shell operators
- Add comprehensive validation tests for both valid and malicious command patterns
