Add breadcrumb schema for better search results

Implements BreadcrumbList JSON-LD structured data:
- Posts list: Home > Posts
- Single post: Home > Posts > Post Title

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: johanrin

layouts/partials/meta/post.html

@@ -35,6 +35,8 @@
     <meta property="article:section" content="{{ index . 0 }}" />
     {{ end }}
 
+    {{/* Article structured data - only for single posts */}}
+    {{ if eq .Page.Kind "page" }}
     <script defer type="application/ld+json">
     {
         "@context": "https://schema.org",
@@ -61,4 +63,35 @@
         }
     }
     </script>
+    {{ end }}
+
+    {{/* Breadcrumb structured data */}}
+    <script defer type="application/ld+json">
+    {
+        "@context": "https://schema.org",
+        "@type": "BreadcrumbList",
+        "itemListElement": [
+            {
+                "@type": "ListItem",
+                "position": 1,
+                "name": "Home",
+                "item": "{{ .Site.BaseURL }}"
+            },
+            {
+                "@type": "ListItem",
+                "position": 2,
+                "name": "Posts",
+                "item": "{{ .Site.BaseURL }}posts/"
+            }
+            {{- if eq .Page.Kind "page" -}}
+            ,{
+                "@type": "ListItem",
+                "position": 3,
+                "name": {{ .Title }},
+                "item": "{{ .Permalink }}"
+            }
+            {{- end -}}
+        ]
+    }
+    </script>
 {{ end }}