fix: bun install, node-addon-api for sharp, consolidate PendingMessageStore (#1140)

* fix: use bun install in sync, add node-addon-api for sharp, consolidate PendingMessageStore

- Switch sync-marketplace from npm to bun install
- Add node-addon-api as dev dep so sharp builds under bun
- Consolidate duplicate PendingMessageStore instantiation in worker-service finally block

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

* build assets

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -118,6 +118,7 @@
     "@types/react": "^18.3.5",
     "@types/react-dom": "^18.3.0",
     "esbuild": "^0.27.2",
+    "node-addon-api": "^8.5.0",
     "np": "^11.0.2",
     "tsx": "^4.20.6",
     "typescript": "^5.3.0"