feat: Add feature_citation toggle for Captain assistants (#12052)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

db/migrate/20250808123008_add_feature_citation_to_assistant_config.rb

@@ -0,0 +1,17 @@
+class AddFeatureCitationToAssistantConfig < ActiveRecord::Migration[7.1]
+  def up
+    Captain::Assistant.find_each do |assistant|
+      assistant.update!(
+        config: assistant.config.merge('feature_citation' => true)
+      )
+    end
+  end
+
+  def down
+    Captain::Assistant.find_each do |assistant|
+      config = assistant.config.dup
+      config.delete('feature_citation')
+      assistant.update!(config: config)
+    end
+  end
+end