Restructure omni services and add Chatwoot research snapshot

research/chatwoot/db/migrate/20250806140001_create_inbox_assignment_policies.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class CreateInboxAssignmentPolicies < ActiveRecord::Migration[7.1]
+  def change
+    create_table :inbox_assignment_policies do |t|
+      t.references :inbox, null: false, index: { unique: true }
+      t.references :assignment_policy, null: false, index: true
+
+      t.timestamps
+    end
+  end
+end