feat: update project structure and enhance UI for Edge Proxy Test

- Add .gitignore to exclude api directory
- Remove deprecated api/index.ts file
- Create new public/index.html with improved UI and functionality
- Update package.json build script to copy index.html to dist
- Enhance request handling in index.html with custom headers and presets
- Improve response display with status, time, and size metrics

.gitignore

@@ -5,6 +5,7 @@ node_modules
 out
 dist
 *.tgz
+api
 
 # code coverage
 coverage