Optimize package management with catalog and exact versions

- Add catalog feature to centralize common dependency versions
- Convert all package versions to exact (remove ^ prefixes)
- Move prettier to root package only to reduce duplication
- Configure bunfig.toml for exact dependency installs
- Improve version consistency across workspace packages

🤖 Generated with opencode
Co-Authored-By: opencode <noreply@opencode.ai>

packages/function/package.json

@@ -5,6 +5,8 @@
   "private": true,
   "type": "module",
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20250522.0"
+    "@cloudflare/workers-types": "4.20250522.0",
+    "typescript": "catalog:",
+    "@types/node": "catalog:"
   }
 }