feat: enhance lottery system with participant import and prize config

- Fix ES module import issue in admin.service.ts (require -> import)
- Fix lottery reveal ghosting by hiding name particles on complete
- Add participant import from Excel with tag calculation
- Add prize configuration service with JSON persistence
- Constrain winners overlay to scroll area dimensions
- Fix macOS lsof syntax in stop script
- Add HorseRace view and renderer (WIP)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -5,6 +5,8 @@
   "packageManager": "pnpm@9.15.0",
   "type": "module",
   "scripts": {
+    "start": "pnpm -r --parallel run dev",
+    "stop": "for port in 3000 5173 5174; do lsof -ti :$port | xargs kill -9 2>/dev/null; done || true",
     "dev": "pnpm -r --parallel run dev",
     "dev:mobile": "pnpm --filter @gala/client-mobile dev",
     "dev:screen": "pnpm --filter @gala/client-screen dev",
@@ -31,4 +33,4 @@
     "node": ">=20.0.0",
     "pnpm": ">=9.0.0"
   }
-}
+}