fix: use node-linker=hoisted in .npmrc to eliminate pnpm symlinks for Vercel deployment

Vercel runs a second pnpm install after our buildCommand completes, which
re-creates pnpm symlinks before the TypeScript function bundler runs. The
previous patch-symlinks.cjs approach was ineffective because it only patched
during our build step, not after Vercel's own re-install.

Add node-linker=hoisted to root .npmrc so pnpm uses a flat node_modules layout
(no symlinks for registry packages) in both install steps. Remove the
now-ineffective patch-symlinks.cjs call from build-vercel.sh.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Agent-Logs-Url: https://github.com/objectstack-ai/objectql/sessions/5c27ebc5-c40a-4756-8482-8f4c6c797208

Author: Copilot

.npmrc

@@ -1 +1,2 @@
 auto-install-peers=false
+node-linker=hoisted

apps/demo/scripts/build-vercel.sh

@@ -8,7 +8,6 @@
 #   1. Build foundation packages (types → plugin-optimizations → plugins → core → platform-node)
 #   2. Build drivers and protocols
 #   3. Build the project-tracker showcase example
-#   4. Patch pnpm symlinks so Vercel can bundle the serverless function
 #
 # Usage (called automatically by Vercel via vercel.json):
 #   bash scripts/build-vercel.sh
@@ -48,9 +47,6 @@ pnpm --filter @objectql/protocol-graphql \
 echo "▸ Building project-tracker example…"
 pnpm --filter @objectql/example-project-tracker build
 
-echo "▸ Patching pnpm symlinks for Vercel…"
-node scripts/patch-symlinks.cjs
-
 # Ensure the output directory exists (Vercel requires it when framework=null)
 mkdir -p public