Skill-Hub v0.3.0

Highlights

• Adds the Skill/Plugin market with GitHub discovery and default sources.
• Shows local installed summaries in the Market for Skills and Plugins.
• Adds Rose Three market refresh loading and per-source progress states.
• Adds app updater metadata and signed updater artifacts.
• Refreshes bilingual README docs and release packaging.

Verification

• PR #1 reviewed and merged.
• npm run typecheck && npm run test
• cargo check --manifest-path src-tauri/Cargo.toml
• cargo test --manifest-path src-tauri/Cargo.toml
• npm run build
• npm run build:desktop produced DMG and updater artifacts.