feat(articles): rewrite B2B article CTAs — directory → /quote form

All 12 hall-building articles now link to /quote (leads.quote_request).
Previously: 2 had broken directory prose, 4 had unlinked planner mentions,
4 had broken [→ placeholder] links, 2 had scenario cards but no CTA link.

- Group 1 (bauen/build-guide): replace directory section with quote CTA
- Group 2 (kosten/risiken): link planner refs, append quote CTA
- Group 3 (finanzierung): append quote CTA after scenario card
- Group 4 (standort/businessplan): fix broken [→] links to /de|en/planner,
  append quote CTA

CTA copy is contextual per article. Light-blue banner pattern, .btn class.
B2C gear articles unaffected.

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

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

@@ -184,4 +184,10 @@ 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>