feat: Add complete Japanese localization via index_ja.html

Update fonts

Move simple explanations above the technical grid

Pin theme toggle to top right on mobile and separate from app menu on desktop

Convert algorithm table to responsive card layout for mobile

Fix responsive mobile design layout

Add Vercel live demo URL to README

Update README references to index.html

Rename algologic.html to index.html for Vercel deployment support

Add detailed README.md

Add A* Search, LRU Cache, and Trie implementations

Update text to AlgoLogic and implement light/dark theme switch