Redesign pricing page with real 4-tier SaaS plans

Replace generic placeholder cards with actual plan data:
- Platform % Only: 0 EGP/12%, Starter: 1,000 EGP/7.5%
- Enterprise: 3,500 EGP/5%, Professional: 10,000 EGP/3.5%
Add detailed comparison table, FAQ section, value strip.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>