fix(deps): remove invalid allowBuilds placeholders from pnpm-workspace.yaml

pnpm auto-injected allowBuilds sections with literal placeholder text
into cli/node and openclaw workspace yamls, causing pnpm install
--frozen-lockfile to fail in CI.

Replace with proper onlyBuiltDependencies entries.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

openclaw/pnpm-workspace.yaml

@@ -1,11 +1,6 @@
 packages:
   - '.'
 
-allowBuilds:
-  better-sqlite3: set this to true or false
-  esbuild: set this to true or false
-  protobufjs: set this to true or false
-
 onlyBuiltDependencies:
   - better-sqlite3
   - esbuild