feat(migrate): add AddCoverToPosts, down and CreateComments

examples/blog/db/migrate/20260906000010_add_status_to_comments.rb

@@ -0,0 +1,9 @@
+class AddStatusToComments < Prism::Orm::Migration
+  def up
+    add_column :comments, :status, :integer, default: 0
+  end
+
+  def down
+    remove_column :comments, :status
+  end
+end