Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/controllers/public_controller.rb

@@ -0,0 +1,21 @@
+# TODO: we should switch to ActionController::API for the base classes
+# One of the specs is failing when I tried doing that, lets revisit in future
+class PublicController < ActionController::Base
+  include RequestExceptionHandler
+  skip_before_action :verify_authenticity_token
+
+  private
+
+  def ensure_custom_domain_request
+    domain = request.host
+    return if DomainHelper.chatwoot_domain?(domain)
+
+    @portal = ::Portal.find_by(custom_domain: domain)
+    return if @portal.present?
+
+    render json: {
+      error: "Domain: #{domain} is not registered with us. \
+      Please send us an email at support@chatwoot.com with the custom domain name and account API key"
+    }, status: :unauthorized and return
+  end
+end