feat: implement frontend core features including authentication, protected routes, and crawl job dashboard management

- Update API_BASE_URL to http://171.247.68.96:4011/api/v1
- Implement Users page: CRUD (list, create, update, delete) with pagination and search
- Implement Logs page: audit logs with userId/action filter, expandable details, pagination
- Support URL_LIST mode in Dashboard create job form (textarea for batch URLs)
- Fix unused mimeType param in JobDetail to pass TypeScript strict check