fix(seo): legal.html canonical, host-case normalisation, BlogPosting x15, blog body domain typo

Four follow-up defects found beyond the 2026-10-27 SEO audit (no copy changes):

1. legal.html canonical was https://ODOO4projects.com/legal — uppercase host AND a
   path that 404s. Now https://odoo4projects.com/legal.html. The file's og:url keeps
   its path /legal but its host is lowercased (path fix awaiting a decision).
2. The no-"4" domain typo in reader-visible <pre><code> body text of
   blog/posts/{guide-migrate-enterprise,speed-run-deploy,my-first-post}.html:
   odooprojects.com -> odoo4projects.com. Domain string only, no other wording.
3. Lowercase host in every machine-read value: the robots.txt Sitemap line, the
   homepage + de/ + es/ Organization JSON-LD url / contactPoint.url / offers[].url,
   legal.html og:url, and the four absolute self-URL hrefs in blog posts,
   odoo/support.html and email/trial-confirmation.html. Display text untouched
   (support@ODOO4projects.com stays as written).
4. One BlogPosting per blog post (15), every value taken from the page itself:
   headline = its <h1>, datePublished = its visible post-meta date, url = its own
   canonical, author/publisher = the Organization the site already publishes,
   image = its og:image where one exists (omitted on the 10 posts that have none).

Empire ">950.00", FAQPage on support.html, the blog-chrome change and the bootcamp
date conflict are untouched — decisions pending with the user.

blog/posts/speed-run-backup.html

@@ -150,6 +150,29 @@
                 text-decoration: underline;
             }
         </style>
+    <script type="application/ld+json">
+      {
+        "@context": "https://schema.org",
+        "@type": "BlogPosting",
+        "headline": "Set Up Automated Backups in Under 2 Minutes",
+        "datePublished": "2026-06-10",
+        "url": "https://odoo4projects.com/blog/posts/speed-run-backup.html",
+        "author": {
+          "@type": "Organization",
+          "name": "ODOO4projects",
+          "url": "https://odoo4projects.com/"
+        },
+        "publisher": {
+          "@type": "Organization",
+          "name": "ODOO4projects",
+          "url": "https://odoo4projects.com/",
+          "logo": {
+            "@type": "ImageObject",
+            "url": "https://odoo4projects.com/images/logo.png"
+          }
+        }
+      }
+    </script>
     </head>
     <body>
         <div class="container">