feat(pitch-deck): interactive charts with Y-axes, click-to-detail, explanations

- All charts now have Y-axis labels with scale
- X-axis with year labels on border lines
- Click any chart → modal with KPI explanation + yearly breakdown
- 8 detail explanations: MRR, EBIT, Headcount, Cash, Rev vs Costs, ACV, Gross Margin, NRR, EBIT Margin
- Unit Economics cards clickable with hover effect
- Compact 2x2 grid for EBIT/Headcount and Cash/RevCost
- ISO 27001 cert moved to Jan 2027 on production

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pitch-deck/middleware.ts

@@ -6,7 +6,6 @@ const PUBLIC_PATHS = [
   '/auth',                    // investor login pages
   '/api/auth',                // investor auth API
   '/api/health',
-  '/api/admin/fp-patch',
   '/api/admin-auth',          // admin login API
   '/pitch-admin/login',       // admin login page
   '/_next',