feat: add /pricing page, fix footer link, update sitemap

[temisan0x]

Closes #137

What

Adds the missing /pricing route that was 404ing from the navbar and homepage CTAs.

Changes

• apps/www/src/app/pricing/page.tsx — new page using PageShell + PageEnter + PageMast, matching the /about pattern
• apps/www/src/components/v2/Footer.tsx — updated Product column Pricing link from /#pricing → /pricing
• apps/www/src/app/sitemap.ts — added /pricing entry

Sections

• Hero (PageMast)
• Starter tier card (0.5% per transaction)
• Add-on table (per-rail cost breakdown)
• Volume pricing strip (0.35% / 0.30% / custom)
• What we don't charge for
• Enterprise card

Checklist

• /pricing returns HTTP 200
• All 6 sections present
• Navbar /pricing link resolves
• Footer /#pricing updated to /pricing
• Added to sitemap.ts
• No new dependencies
• TypeScript — no type errors

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