Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/controllers/concerns/attachment_concern.rb

@@ -0,0 +1,35 @@
+module AttachmentConcern
+  extend ActiveSupport::Concern
+
+  def validate_and_prepare_attachments(actions, record = nil)
+    blobs = []
+    return [blobs, actions, nil] if actions.blank?
+
+    sanitized = actions.map do |action|
+      next action unless action[:action_name] == 'send_attachment'
+
+      result = process_attachment_action(action, record, blobs)
+      return [nil, nil, I18n.t('errors.attachments.invalid')] unless result
+
+      result
+    end
+
+    [blobs, sanitized, nil]
+  end
+
+  private
+
+  def process_attachment_action(action, record, blobs)
+    blob_id = action[:action_params].first
+    blob = ActiveStorage::Blob.find_signed(blob_id.to_s)
+
+    return action.merge(action_params: [blob.id]).tap { blobs << blob } if blob.present?
+    return action if blob_already_attached?(record, blob_id)
+
+    nil
+  end
+
+  def blob_already_attached?(record, blob_id)
+    record&.files&.any? { |f| f.blob_id == blob_id.to_i }
+  end
+end