feat: SEO change history

models/revision/columns.yaml

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+# History list columns (UI-SPEC C12). via_label, change and batch are
+# filled by the controller's ListExtendRecords.
+columns:
+    created_at:
+        label: golem15.seo::lang.history.when
+        type: datetime
+        sortable: true
+    author_label:
+        label: golem15.seo::lang.history.who
+        type: text
+        searchable: true
+    via_label:
+        label: golem15.seo::lang.history.via
+        type: text
+        sortable: false
+    what:
+        label: golem15.seo::lang.history.what
+        type: text
+        searchable: true
+    change:
+        label: golem15.seo::lang.history.change
+        type: text
+        sortable: false
+    batch:
+        label: golem15.seo::lang.history.batch
+        type: text
+        sortable: false
+        invisible: true

models/revision/fields.yaml

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+# History preview (UI-SPEC C12): read-only fields, then the P5 diff.
+fields:
+    created_at:
+        label: golem15.seo::lang.history.when
+        type: text
+        span: left
+        context: preview
+    author_label:
+        label: golem15.seo::lang.history.who
+        type: text
+        span: right
+        context: preview
+    via:
+        label: golem15.seo::lang.history.via
+        type: text
+        span: left
+        context: preview
+    what:
+        label: golem15.seo::lang.history.what
+        type: text
+        span: right
+        context: preview
+    _history_diff:
+        label: golem15.seo::lang.history.change
+        type: partial
+        path: history_diff
+        span: full
+        context: preview