refactor: migrate to Next.js with edge functions and update relay utilities

- Removed old relay utilities and tests, replacing them with a new structure under `src/lib/relay-utils.ts`.
- Implemented a new edge function in `app/api/proxy/route.ts` to handle proxy requests.
- Created a new Next.js layout and page structure for the frontend, including a user interface for testing the proxy.
- Added Tailwind CSS for styling and configured PostCSS.
- Updated TypeScript configuration for better compatibility with Next.js.
- Removed unused files and configurations related to the previous setup.

package.json

@@ -3,16 +3,22 @@
 	"type": "module",
 	"private": true,
 	"scripts": {
-		"build": "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",
-		"lint": "biome check .",
-		"lint:fix": "biome check --write .",
-		"check": "bunx tsc --noEmit"
+		"dev": "next dev",
+		"build": "next build",
+		"start": "next start",
+		"lint": "next lint",
+		"test": "bun test"
 	},
 	"devDependencies": {
 		"@biomejs/biome": "^2.4.14",
-		"@types/bun": "latest"
+		"@types/bun": "latest",
+		"autoprefixer": "^10.5.0",
+		"postcss": "^8.5.14",
+		"tailwindcss": "^4.2.4"
+	},
+	"dependencies": {
+		"next": "^16.2.5",
+		"react": "^19.2.6",
+		"react-dom": "^19.2.6"
 	}
 }