chore: update kirby-seo plugin to v2.0.0-alpha.12

Update plugin from v1.1.2 to v2.0.0-alpha.12 for Kirby 5 compatibility.

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

site/plugins/kirby-seo/blueprints/fields/og-group.yml

@@ -0,0 +1,42 @@
+type: group
+fields:
+  _ogHeadline:
+    label: seo.page.og.headline
+    type: headline
+    numbered: false
+    help: seo.site.og.headline.help
+  ogTemplate:
+    extends: seo/fields/title-template
+    label: seo.fields.ogTitleTemplate.label
+    width: 2/3
+    help: seo.fields.metaTitleTemplate.help
+    placeholder: "{{ page.metadata.ogTemplate }}"
+  useOgTemplate:
+    label: seo.fields.useTitleTemplate.label
+    type: toggle
+    help: seo.fields.useTitleTemplate.help
+    width: 1/3
+    default: true
+    text:
+      - "{{ t('seo.fields.useTitleTemplate.no') }}"
+      - "{{ t('seo.fields.useTitleTemplate.yes') }}"
+  ogDescription:
+    label: seo.fields.ogDescription.label
+    type: seo-writer
+    ai: og-description
+    placeholder: "{{ page.metadata.ogDescription }}"
+  ogImage:
+    label: seo.fields.ogImage.label
+    extends: seo/fields/og-image
+    empty: seo.fields.ogImage.empty
+  cropOgImage:
+    label: seo.fields.cropOgImage.label
+    type: select
+    width: 1/1
+    placeholder: "{{ t('seo.common.default') }} {{ site.cropOgImage.toBool ? t('seo.common.yes') : t('seo.common.no') }}"
+    options:
+      "true": "{{ t('seo.common.yes') }}"
+      "false": "{{ t('seo.common.no') }}"
+    help: seo.fields.cropOgImage.help
+  _seoLine2:
+    type: line