fix(articles): add /quote CTA + planner links in cost and risk articles

- padel-halle-kosten-de, padel-hall-cost-guide-en: link planner ref,
  append quote CTA "Zahlen prüfen — Angebote einholen"
- padel-halle-risiken-de, padel-hall-investment-risks-en: link planner
  in sensitivity tab mention, append quote CTA on risk management

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/content/articles/padel-hall-cost-guide-en.md

@@ -191,4 +191,10 @@ Opening a padel hall in Germany in 2026 is a real capital commitment: €930k on
 
 The investors who succeed here are not the ones who found a cheaper build. They are the ones who understood the numbers precisely enough to make the right location and concept decisions early — and to structure their financing before the costs escalated.
 
-**Next step:** Use the Padelnomics Financial Planner to model your specific scenario — your city, your financing mix, your pricing assumptions. The figures in this article are your starting point; your hall deserves a projection built around your actual numbers.
+**Next step:** Use the [Padelnomics Financial Planner](/en/planner) to model your specific scenario — your city, your financing mix, your pricing assumptions. The figures in this article are your starting point; your hall deserves a projection built around your actual numbers.
+
+<div style="background:#EFF6FF;border:1px solid #BFDBFE;border-radius:12px;padding:1.5rem 2rem;margin:2rem 0;">
+  <p style="margin:0 0 0.5rem;font-weight:600;color:#0F172A;font-size:1.0625rem;">Test your numbers against real market prices</p>
+  <p style="margin:0 0 1rem;color:#334155;font-size:0.9375rem;">Once your model is in shape, the next step is benchmarking against actual quotes. Describe your project — we'll connect you with build partners who can give you concrete figures for your specific facility. Free and non-binding.</p>
+  <a href="/quote" class="btn">Request a Quote</a>
+</div>