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-build-guide-en.md

@@ -331,8 +331,10 @@ Building a padel hall is complex, but it is a solved problem. The failures are n
 
 ---
 
-## Find Builders and Suppliers Through Padelnomics
+## Find the Right Build Partners
 
-Padelnomics maintains a directory of verified build partners for padel hall projects: architects with sports facility experience, court suppliers, HVAC specialists, and operational consultants.
-
-If you're currently in Phase 1 or Phase 2 and looking for the right partners, the directory is the fastest place to start.
+<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;">Get quotes from verified build partners</p>
+  <p style="margin:0 0 1rem;color:#334155;font-size:0.9375rem;">From feasibility to court installation: describe your project in a few minutes — we'll connect you with vetted architects, court suppliers, and MEP specialists. Free and non-binding.</p>
+  <a href="/quote" class="btn">Request a Quote</a>
+</div>