v6.4.5 - v4 v5 added

🚀 New Features & Improvements

• Toolbox Refactoring: Migrated /project/tools to /project/toolbox with full backward-compatible redirect aliases (/tools/, /lab/, /toolbox/, etc.).
• Interactive Archive Versions: Compiled and embedded standalone historical versions v4 (Chloe) and v5 (Sylvie) directly under /versions/v4/ and /versions/v5/.
• Minimalist Versions Hub: Redesigned /versions page with clean, box-free badges, direct arrow links for past iterations, and a new direct navigation section on the homepage.
• Asset Directory Restructure: Renamed assets folder to /asset/ and cleaned up unused CSS/JS/HTML styles across the theme.
• Legacy Cleanup: Removed obsolete /about pages and extraneous contact links from legacy builds, and secured/cleared legacy API URLs.
• Documentation & UI Refinements: Refined Contact copy and added detailed asset credits in README.md.