v1.1.1: Release Packaging and Catalog Update

[arnaudassoumani-collab]

Parent epic: #14

Scope

• Bump extension/package versions to 1.1.1
• Generate immutable version pack chromium-extension-versions/v1.1.1
• Update CATALOG.json and release notes
• Preserve previous immutable packs untouched

Acceptance

• v1.1.1 pack loadable from catalog
• release notes include v1.1.1 highlights
• rollback to v1.1.0 documented