feat: use Lucide icons (pictograms) for eggs instead of Simple Icons brand logos

- Add 200+ curated Lucide icons (code, database, server, terminal, etc.)
- Egg SVG picker now shows Lucide pictograms instead of brand logos
- Nest SVG picker still uses Simple Icons (brand logos)
- Store egg icons as lucide:name prefix in logo field
- Update egg rendering in admin tables and create wizard

Author: ddrayko