Restructure omni services and add Chatwoot research snapshot

research/chatwoot/db/migrate/20250806140000_create_assignment_policies.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class CreateAssignmentPolicies < ActiveRecord::Migration[7.1]
+  def change
+    create_table :assignment_policies do |t|
+      t.references :account, null: false, index: true
+      t.string :name, null: false, limit: 255
+      t.text :description
+      t.integer :assignment_order, null: false, default: 0 # 0: round_robin, 1: balanced
+      t.integer :conversation_priority, null: false, default: 0 # 0: earliest_created, 1: longest_waiting
+      t.integer :fair_distribution_limit, null: false, default: 100
+      t.integer :fair_distribution_window, null: false, default: 3600 # seconds
+      t.boolean :enabled, null: false, default: true
+
+      t.timestamps
+    end
+
+    add_index :assignment_policies, [:account_id, :name], unique: true
+    add_index :assignment_policies, :enabled
+  end
+end