Prepare for v1.0.0 Stable Release

[Che-Zhu]

Summary

This PR prepares Fulling for its first stable release (v1.0.0). It includes a major UI consistency refactor and documentation updates.

Changes

🎨 Icon System Migration

• Replaced lucide-react icons with react-icons/md (Material Design) across all business components
• Used react-icons/fa (FontAwesome) for brand icons (GitHub)
• Shadcn UI components remain unchanged to maintain compatibility with future updates

Affected areas:

• Sidebar & Navigation
• Project List (cards, headers, dropdowns)
• Terminal (toolbar, tabs, dialogs)
• Business Dialogs (create project, settings)
• Config Components (env-var-section)
• All app pages (login, error, not-found, project settings)

📝 Documentation Updates

• Added v1.0.0-stable version badge to README
• Updated Node.js version requirement from 20.x to 22.9.0 (matching engines in package.json)
• Added CHANGELOG.md reference
• Fixed repository URLs in CONTRIBUTING.md (FullAgent/fulling)

Stats

• 26 files changed
• 130 insertions, 108 deletions

Testing

• Dev server runs without errors
• No remaining lucide-react imports in business components

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  Commit: d2be379797a6590f41ab1a73cf5aacf520a98644
  Branch: prepare/first-stable-release

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