feat(frontend): Add betterauth migration script

legalconsenthub/package.json

@@ -13,7 +13,8 @@
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "api:generate": "openapi-generator-cli generate -i ../legalconsenthub-backend/api/legalconsenthub.yml -g typescript-fetch -o .api-client",
-    "fix:bettersqlite": "cd node_modules/better-sqlite3 && pnpm dlx node-gyp rebuild && cd ../.."
+    "fix:bettersqlite": "cd node_modules/better-sqlite3 && pnpm dlx node-gyp rebuild && cd ../..",
+    "migrate:betterauth": "pnpm dlx @better-auth/cli migrate --config server/utils/auth.ts"
   },
   "dependencies": {
     "@nuxt/ui-pro": "3.0.1",