♻️ refactor: migrate AI Rules to Claude Code Skills system
Migrate all AI Rules from .cursor/rules/ to .agents/skills/ directory:
- Move 23 skills to .agents/skills/ (main directory)
- Update symlinks: .claude/skills, .cursor/skills, .codex/skills
- Create project-overview skill from project documentation
- Add references/ subdirectories for complex skills
- Remove LobeChat references from skill descriptions
- Delete obsolete .cursor/rules/ and .claude/commands/prompts/ directories
Skills structure enables better portability and maintainability across AI tools.
* 🐛 fix: fix desktop test cases and refactor translations
- Import translations from default locale instead of hardcoding
- Fix macOS menu test expectations to match actual translations
- Update I18nManager test to match implementation (fallbackLng: 'en')
- Support {{appName}} interpolation in test mocks
* 🐛 fix: add missing buildAndSetAppMenu calls in tests
