Update all CTA section backgrounds to primary + success gradient

Replaced pinkish/purple gradient backgrounds with brand colors on:
- Partners page: Footer CTA section
- CaseStudies page: Footer CTA section
- Pricing page: Footer CTA section
- Solutions page: Footer CTA section
- Product page: Footer CTA section

Changed from: from-primary via-purple to-purple-400
Changed to: from-success via-primary-dark to-primary

All CTA sections before footer now use consistent brand gradient matching the logo colors (primary + success mix) instead of purple/pink tones.

frontend/src/marketing/pages/Pricing.tsx

@@ -489,7 +489,7 @@ const Pricing: React.FC = () => {
       </section>
 
       {/* FINAL CTA */}
-      <section className="relative overflow-hidden bg-gradient-to-br from-[var(--color-primary)] via-[var(--color-purple)] to-[var(--color-purple-400)]">
+      <section className="relative overflow-hidden bg-gradient-to-br from-[var(--color-success)] via-[var(--color-primary-dark)] to-[var(--color-primary)]">
         {/* Radial glow */}
         <div className="absolute inset-0 bg-[radial-gradient(circle_at_50%_50%,rgba(255,255,255,0.1),transparent_70%)]" />