fix(studio): change Vercel runtime from @vercel/node@3 to nodejs20.x

The `@vercel/node@3` runtime specifier is no longer recognized by
Vercel CLI 50.x. Use the standard `nodejs20.x` format instead.

Fixes: "Function Runtimes must have a valid version" deployment error

Agent-Logs-Url: https://github.com/objectstack-ai/spec/sessions/59d30bb9-1607-4c8c-9a2d-64c755f50454

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

apps/studio/CHANGELOG.md

@@ -11,6 +11,11 @@
   - Added `buildServiceEndpoints()` helper for generating endpoint definitions from a service name and route prefix
   - Updated group sort order to include service groups between Auth and Metadata
 
+### Fixes
+
+- **Vercel deployment: Fix `@vercel/node@3` runtime error**
+  - Changed `vercel.json` functions runtime from deprecated `@vercel/node@3` to `nodejs20.x` to fix Vercel CLI 50.x build error: "Function Runtimes must have a valid version"
+
 ## 3.3.1
 
 ### Patch Changes

apps/studio/vercel.json

@@ -6,7 +6,7 @@
   "outputDirectory": "dist",
   "functions": {
     "api/index.js": {
-      "runtime": "@vercel/node@3"
+      "runtime": "nodejs20.x"
     }
   },
   "build": {