fix: build @objectql/driver-sql before project-tracker example in build-vercel.sh

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Agent-Logs-Url: https://github.com/objectstack-ai/objectql/sessions/731333d3-1322-401d-919d-f43127ea9c08

Author: Copilot

apps/demo/scripts/build-vercel.sh

@@ -35,7 +35,9 @@ echo "▸ Building @objectql/platform-node…"
 pnpm --filter @objectql/platform-node build
 
 echo "▸ Building drivers…"
-pnpm --filter @objectql/driver-memory build
+pnpm --filter @objectql/driver-memory \
+     --filter @objectql/driver-sql \
+     build
 
 echo "▸ Building protocols…"
 pnpm --filter @objectql/protocol-graphql \