feat: add GameGroup2 project with frontend and backend

- Add .gitignore for Node.js and PocketBase projects
- Add frontend (Vue 3 + Vite + TypeScript)
- Add backend (PocketBase)
- Add deployment scripts and Docker compose configs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/.env

@@ -1,3 +1,5 @@
 PB_PORT=8090
 PB_DATA=./pb_data
 PB_MIGRATIONS=./pb_migrations
+PB_UID=1000
+PB_GID=1000