feat(blog): publish "How to Install Odoo Modules Using Git"

New post at blog/posts/how-to-install-odoo-modules-using-git.html
(2026-10-28, area "deep dive"), body pasted verbatim from the boss's
supplied block (7 h2, two figures in place). Chrome copied from the
newest post (odoo-community-is-going-online-on-odoo4projects.html:
main.blog-post / span.badge / div.post-meta / img.post-image /
div.post-body / a.back-link), style block trimmed to the rules this
page uses plus the ol/figure/figcaption rules its body needs.

Additive wiring: og:image + twitter:card, post-image after post-meta
(alt = h1), BlogPosting JSON-LD with dateModified.

blog/index.json gets the entry first (newest-first, key order
id,date,area,headline,teaser,link,image) by text splice - 15 -> 16
posts; sitemap.xml one new 0.6 blog url - 35 -> 36 <loc>; llms.txt one
new line at the top of the post list.

blog/index.json

@@ -1,5 +1,14 @@
 {
   "posts": [
+    {
+      "id": "how-to-install-odoo-modules-using-git",
+      "date": "2026-10-28",
+      "area": "deep dive",
+      "headline": "How to Install Odoo Modules Using Git — and the Quick Git Route That Skips the Console",
+      "teaser": "Every business is slightly different, which is why a system that only does the standard thing is only ever half a system",
+      "link": "blog/posts/how-to-install-odoo-modules-using-git.html",
+      "image": "https://image.office.odoo4projects.com/img/screenshot_git.png"
+    },
     {
       "id": "odoo-community-is-going-online-on-odoo4projects",
       "date": "2026-10-27",