Add /de/odoo-beratung/ — the German consulting page the site never had

227 impressions of consulting intent were all landing on /de/, a homepage
sitting at positions 45-88: 'odoo beratung' 163 impr @ 51.4, 'odoo berater'
28 @ 47.0, 'odoo erp beratung' 13 @ 45.8, 'odoo expert' 18 @ 68.3, 'odoo
experte' 5 @ 63.2. German pages overall: 439 impressions, 0 clicks.

Written in German as German, not translated from the Spanish pages:
- 'Wann Sie keine Beratung brauchen' comes first, because that is the honest
  answer for most readers and nobody writes it.
- 'Was den Preis wirklich bestimmt' — number of person-days, not day rate, and
  an explicit warning that a fixed price without looking at the data is a bet.
  The only figure quoted is the verifiable one: hosting from 14/year.
- Localisation restricted to what the addons tree supports: l10n_de is in the
  community branch; SKR03/SKR04 and DATEV are not separate packages there, so
  the page says check your version rather than asserting either way. No EDI in
  community, same as everywhere.
- Five vetting questions plus links to the official partner directory for
  Germany, Austria and Switzerland (all verified 200). No firms named.

Linked from /de/ and /de/odoo/, added to sitemap-de.xml. Article + FAQPage +
Breadcrumb schema, lang=de.

de/odoo/index.html

@@ -247,6 +247,13 @@
     <section class="directory-hero">
         <div class="container">
             <h1>Centro de Conocimiento Odoo</h1>
+            <div style="margin:22px 0;padding:16px 20px;background:#101720;border:1px solid #2a3441;border-radius:12px;">
+                <strong style="display:block;margin-bottom:6px;">Odoo Beratung — wann sie sich lohnt</strong>
+                <p style="margin:0;color:#c9d1d9;font-size:.95rem;">Wann externe Unterstützung sinnvoll ist,
+                was den Preis bestimmt und welche fünf Fragen Sie jedem Partner stellen sollten:
+                <a href="/de/odoo-beratung/">zur Odoo-Beratung</a>.</p>
+            </div>
+
             <p>Explora nuestros artículos, guías y recursos sobre Odoo ERP para transformar tu negocio</p>
         </div>
     </section>