feat(libs): r2-idb-sync bridge — sync-wire protocol, FE/BE packages, apps/server resolve+origin serving, GPL adapter

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/standalone/package.json

@@ -15,6 +15,7 @@
   "dependencies": {
     "@hocuspocus/provider": "^4.1.1",
     "@pcbjam/shared": "workspace:*",
+    "@pcbjam/sync-client": "workspace:*",
     "@radix-ui/react-dialog": "^1.1.4",
     "@radix-ui/react-label": "^2.1.1",
     "@radix-ui/react-slot": "^1.1.1",