feat: migrate from Next.js to pure Bun relay proxy

- Replace Next.js app router with standalone Bun.serve() entry point
- Add middleware stack: rate limiter, body limiter, structured logger, SSRF protection
- Add WebSocket bidirectional relay via x-relay-target header
- Implement error classification (DNS→502, timeouts→504, SSRF→403, rate→429)
- Remove all Next.js dependencies and config files
- Update deploy workflow, tsconfig, wrangler config for Bun deployment

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -1,41 +1,20 @@
 {
-  "name": "real-starter",
-  "version": "0.1.0",
+  "name": "edge-proxy-relay",
+  "version": "1.0.0",
   "private": true,
+  "type": "module",
   "scripts": {
-    "dev": "next dev",
-    "build": "next build",
-    "start": "next start",
-    "lint": "eslint",
-    "build:worker": "bunx opennextjs-cloudflare build",
-    "preview": "wrangler dev",
-    "deploy": "bun run build:worker && wrangler deploy"
-  },
-  "dependencies": {
-    "@base-ui/react": "^1.4.1",
-    "class-variance-authority": "^0.7.1",
-    "clsx": "^2.1.1",
-    "lucide-react": "^1.14.0",
-    "next": "16.2.5",
-    "next-themes": "^0.4.6",
-    "react": "19.2.4",
-    "react-dom": "19.2.4",
-    "shadcn": "^4.7.0",
-    "sonner": "^2.0.7",
-    "tailwind-merge": "^3.5.0",
-    "tw-animate-css": "^1.4.0"
+    "dev": "bun --hot src/index.ts",
+    "start": "bun src/index.ts",
+    "test": "bun test",
+    "test:watch": "bun test --watch",
+    "typecheck": "tsc --noEmit",
+    "build": "bun build src/index.ts --outdir ./dist --target bun",
+    "build:worker": "bun build src/index.ts --outdir ./dist --target bun --format esm"
   },
+  "dependencies": {},
   "devDependencies": {
-    "@tailwindcss/postcss": "^4",
-    "@types/node": "^20",
-    "@types/react": "^19",
-    "@types/react-dom": "^19",
     "bun-types": "^1.3.13",
-    "eslint": "^9",
-    "eslint-config-next": "16.2.5",
-    "tailwindcss": "^4",
-    "typescript": "^5",
-    "@opennextjs/cloudflare": "latest",
-    "wrangler": "^4.90.0"
+    "typescript": "^5"
   }
 }