feat: add assignment service

app/models/inbox.rb

@@ -44,6 +44,7 @@ class Inbox < ApplicationRecord
   include Avatarable
   include OutOfOffisable
   include AccountCacheRevalidator
+  include InboxAgentAvailability
 
   # Not allowing characters:
   validates :name, presence: true
@@ -190,6 +191,10 @@ class Inbox < ApplicationRecord
     members.ids
   end
 
+  def auto_assignment_enabled?
+    account.feature_enabled?('assignment_v2') && assignment_policy.present? && assignment_policy.enabled?
+  end
+
   private
 
   def default_name_for_blank_name