docs: reorganize project documentation and improve README

- Move CLAUDE.md to .claude/CLAUDE.md for better organization
- Remove deprecated manifest-creator skill
- Add project icon to README
- Improve README links formatting

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ericyangpan

CLAUDE.md .claude/CLAUDE.mdCLAUDE.md renamed to .claude/CLAUDE.md

@@ -5,7 +5,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ## Internationalization (i18n)
 
 When creating or modifying any page, module, or data:
-- **MUST support at least 3 languages:** English, Simplified Chinese (zh-Hans), and German (de), NEVER hardcode `'en' | 'zh-Hans'`
+- **MUST support at least 4 languages:** English, Simplified Chinese (zh-Hans), German (de), and Korean (ko), NEVER hardcode `'en' | 'zh-Hans'`
 - **MUST use the localized Link component:** Always import and use `import { Link } from '@/i18n/navigation'` instead of Next.js default Link
 
 ### Localization Best Practices