test: migrate from bun to pnpm and vitest

tsconfig.json

@@ -1,32 +1,27 @@
 {
   "compilerOptions": {
-    "types": ["@types/bun"],
+    "types": ["@cloudflare/workers-types"],
     "baseUrl": "./",
     "paths": {
       "~/*": ["src/*"]
     },
-
     // Enable latest features
     "lib": ["ESNext"],
     "target": "ESNext",
     "module": "ESNext",
-
     // Bundler mode
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
     "verbatimModuleSyntax": true,
     "noEmit": true,
-
     // Best practices
     "strict": true,
     "skipLibCheck": true,
     "noFallthroughCasesInSwitch": true,
-
     // Some stricter flags
     "noUnusedLocals": true,
     "noUnusedParameters": false,
     "noPropertyAccessFromIndexSignature": true,
-
     // plugins
     "plugins": [
       {