Remove all emojis, fix flow icon in Home-zh, add category icons to Home-en
Complete wiki restructure: real block SVGs, all 14 categories in zh+en - Extracted 87 real Blockly block SVGs using Puppeteer + local renderer - Created 28 category pages (14 categories × 2 languages) - Updated Home and Blocks index pages - All 348 image references verified
Fix Home.md as language selector, rewrite Home-zh/en with proper encoding
Use generic releases page link instead of specific version
Add Home-zh.md and Home-en.md