Clipon CMS 0.10.3

• Added the automated Core release pipeline that publishes the sanitized public source, immutable GitHub tag, ZIP archive, and SHA-256 checksum from one deterministic export.
• Integrated stable releases with the protected license-server Release API and added end-to-end verification of public metadata, the CMS update API, and the latest-download redirect.
• Replaced version-specific website and Core download URLs with the permanent https://server.clipon-cms.com/download/latest endpoint.
• Added regression coverage for release workflow helpers, stable download links, and preservation of Core update version, package URL, changelog, and SHA-256 metadata.