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

package.json

@@ -4,7 +4,7 @@
 	"type": "module",
 	"private": true,
 	"scripts": {
-		"build": "bun build src/index.ts --target=bun --outdir=api",
+		"build": "bun build src/index.ts --target=bun --outdir=api && mkdir -p dist && cp public/index.html dist/index.html",
 		"start": "bun run src/index.ts",
 		"dev": "bun --hot run src/index.ts",
 		"test": "bun test",