Release v1.1.0 - Bug fixes and utility additions

[mcpdev0910]

This release PR prepares Harmony v1.1.0 with critical fixes and developer experience improvements.

Included changes:

1. MetaSep token fix (from PR fix: meta_sep token and add to registry #25)

   • src/encoding.rs: Corrected FormattingToken::MetaSep mapping to <|meta_sep|> (was incorrectly <|channel|>)
   • src/registry.rs: Registered MetaSep and MetaEnd formatting tokens so both native and WASM builds recognize them

2. Demo utility additions (from PR Fix shadcn utils file in js demo #26)

   • demo/harmony-demo/src/lib/utils.ts: Added missing shadcn cn() utility
   • .gitignore: Enhanced to avoid ignoring shadcn utils directory

3. Version bump

   • Cargo.toml: Updated [package] version to 1.1.0

4. Changelog

   • CHANGELOG.md: Added comprehensive notes for the 1.1.0 release

Rationale:

• Fixes a critical tokenizer bug affecting meta formatting tokens.
• Ensures registry consistency across builds for MetaSep and MetaEnd.
• Restores necessary UI utility in the demo application.
• Documents changes and updates version for release.

After merging, please tag the release if desired and publish crates as needed.