Add staging-siteglide.com to allowed platform URL check; bump to 1.10.3

[JoshCarterWeb]

What

• Extend platform URL validation in siteglide-cli-add.js to accept staging-siteglide.com alongside:
  • platform-os.com
  • platformos.com
  • uk-siteglide.com
• Bump package version to 1.10.3.

Why

Environments hosted on *.staging-siteglide.com were incorrectly treated as vanity URLs and blocked. This change updates the allow-list so staging platform URLs are recognised as valid.

How

Add !params.url.includes('staging-siteglide.com') to the existing validation condition. No other behavioural changes.

Risks & Considerations

• Risk: Low—broadens validation to another first-party domain.

Testing

• ✅ https://my-site.staging-siteglide.com/ now passes.
• ✅ https://my-site.uk-siteglide.com/, https://my-site.platformos.com/, and https://my-site.platform-os.com/ continue to pass.
• ❌ Known vanity domains continue to fail as expected.

Changelog

• Accept *.staging-siteglide.com as a valid platform URL when adding environments.
• Bump version to 1.10.3.