feat(swimming): improve registration form with live membership lookup and NID auto-fill

- Membership number field with live search that auto-fills all player data
- National ID field auto-extracts DOB, gender, and age (Egyptian 14-digit NID parsing)
- NID also checks membership status automatically
- Added date_of_birth, gender, age, and address fields
- Matches the UX pattern of the existing SA registration wizard
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>