Rank /odoo-ia/ for 'odo ia': define the term, add depth, cross-link the hubs

Internal linking was already fine (162 pages link here, 252 anchors 'Odoo IA',
54 of 55 child articles link back), so the gap was the page itself: it listed 55
links and never defined the term it ranks for.

- 'Que es Odoo IA?' definition block under the hero, in the page's own words,
  with the three layers that matter commercially: nativo / integracion / local.
- Six use cases (atencion, documentos, CRM, contabilidad, inventario, procesos),
  each linking to the article that covers it. Hub depth, not just a directory.
- ItemList schema for those six entries, matching visible content.
- /odoo-hosting/ now links to /odoo-ia/ in body copy: the two money hubs were
  not linked to each other at all.

No version-specific feature claims: each statement is conditional on version and
edition, because odoo.com has no AI page to verify a feature list against.

odoo-hosting/index.html

@@ -255,7 +255,7 @@
     <section class="directory-hero">
         <div class="container">
             <h1>Centro de Recursos Hosting Odoo</h1>
-            <p>Todo lo que necesitas saber sobre infraestructura, proveedores y optimización de hosting para tu ERP Odoo</p>
+            <p>Todo lo que necesitas saber sobre infraestructura, proveedores y optimización de hosting para tu ERP Odoo Si además estás montando el servidor, la <a href="/odoo-ia/">guía de Odoo IA</a> explica qué parte de la automatización depende de la infraestructura y cuál no.</p>
         </div>
     </section>