fix(articles): fix broken CTA links + add /quote CTA in location and business plan articles

- padel-standort-analyse-de, padel-hall-location-guide-en:
  fix [→ ...] placeholders to /de/planner and /en/planner
  append quote CTA "Standort gefunden? Angebote einholen"
- padel-business-plan-bank-de, padel-business-plan-bank-requirements-en:
  fix [→ Businessplan erstellen] / [→ Generate your business plan] to planner
  append quote CTA "Bankfähige Zahlen plus passende Baupartner"

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

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

@@ -166,4 +166,10 @@ Padelnomics tracks venue density, booking platform utilisation, and demographic
 
 Padelnomics analyzes market data for your target area: player density, competitive supply, demand signals from booking platform data, and demographic indicators at municipality level. For your candidate sites, Padelnomics produces a catchment area profile and a side-by-side comparison — so the decision is grounded in data rather than a map with a finger pointing at it.
 
-[→ Run a location analysis]
+[→ Run a location analysis](/en/planner)
+
+<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;">Site shortlisted — time to get quotes</p>
+  <p style="margin:0 0 1rem;color:#334155;font-size:0.9375rem;">Once a location passes your criteria, the next step is engaging architects and court suppliers. Describe your project — we'll connect you with vetted build partners who can give you concrete figures. Free and non-binding.</p>
+  <a href="/quote" class="btn">Request a Quote</a>
+</div>