* codeuchain site + buf-json demo

* rm buf-json and sent to github,com/orchestrate-solutions/buf-json

* feat: Add clean URL router for docs site

- Add 404.html router that handles clean URLs without index.html
- Update navigation links to use clean URLs (e.g., /docs/go instead of /docs/go/index.html)
- Support all language routes with aliases (c#, c++, js, etc.)
- Handle section anchors and sub-routes
- Preserve query parameters and hash fragments
- Add comprehensive router test suite
- Update main index.html and go/index.html with clean URLs

* fix: Add missing json-reader.js and rebuild HTML pages

* Fix logo links for clean URL routing - update base.json to use '../' instead of '../index.html'

* fix: Resolve codeuchain.com routing build issues with template variables

- Fix async/await handling in build.js for proper template processing
- Update json-reader.js to async RuntimeJSONReader with caching
- Add 'is_homepage': false to all language data files for proper conditional logic
- Fix language-navigation.html template variables (relative paths, highlighting, conditionals)
- Ensure all template variables are properly replaced in generated HTML pages
- Verify build process works correctly for all 11 pages (main + 10 languages)

* feat: Implement clean URL routing for docs site

- Remove all 'index.html' references from footer and navigation links
- Update footer.html with conditional logic for clean directory paths
- Update language-navigation.html with proper URL conditionals
- Generate all HTML pages with clean URLs (pseudo/, python/, etc.)
- All navigation links now use directory paths without index.html suffix
- Maintains proper routing for both homepage and language-specific pages