feat(admin-auth): add first-start onboarding flow and dev db reset command

docs/getting-started.md

@@ -20,6 +20,12 @@ bun run db:migrate
 bun run db:seed
 ```
 
+Reset local dev DB:
+
+```bash
+bun run db:reset:dev
+```
+
 ## Run apps
 
 ```bash
@@ -28,7 +34,9 @@ bun run dev
 
 - Web: `http://localhost:3000`
 - Admin: `http://localhost:3001`
+- Admin welcome (first start): `http://localhost:3001/welcome`
 - Admin login: `http://localhost:3001/login`
+- Admin register (when enabled): `http://localhost:3001/register`
 
 ## Run docs