Add @libsql/client to build-vercel.sh copy logic

- Update build-vercel.sh to copy @libsql/client to local node_modules
- Remove outdated comment about @libsql/client being bundled
- Ensures @libsql/client is available in Vercel serverless function

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/bba47546-4868-4fbb-94cc-909dd5f6757d

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

Author: Claude

apps/studio/scripts/build-vercel.sh

@@ -38,10 +38,8 @@ node scripts/bundle-api.mjs
 #    The vercel.json includeFiles pattern references node_modules/ relative to
 #    apps/studio/, so we must copy the actual module files here for Vercel to
 #    include them in the serverless function's deployment package.
-#
-#    Note: @libsql/client is now bundled by esbuild, so we no longer copy it.
 echo "[build-vercel] Copying external native modules to local node_modules..."
-for mod in better-sqlite3; do
+for mod in better-sqlite3 @libsql/client; do
   src="../../node_modules/$mod"
   if [ -e "$src" ]; then
     dest="node_modules/$mod"