- Installment panel in member show page now uses flat simple interest:
  remaining × (rate/100) × (months/12) instead of hardcoded 22% × 30mo
- Live breakdown table updates in real-time as user changes down payment
  or months: shows سعر العضوية, المقدم, المبلغ المتبقي, الفائدة,
  الإجمالي مع الفائدة, القسط الشهري
- Pass installInterestRate and installMaxMonths from RuleEngine to show view
- Fix pay-membership action to respect RuleEngine max months (not hardcoded 30)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>