Restructure omni services and add Chatwoot research snapshot

research/chatwoot/db/migrate/20250806140005_create_leaves.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class CreateLeaves < ActiveRecord::Migration[7.1]
+  def change
+    create_table :leaves do |t|
+      t.references :account, null: false
+      t.references :user, null: false
+      t.date :start_date, null: false
+      t.date :end_date, null: false
+      t.integer :leave_type, null: false, default: 0
+      t.integer :status, null: false, default: 0
+      t.text :reason
+      t.references :approved_by
+      t.datetime :approved_at
+
+      t.timestamps
+    end
+
+    add_index :leaves, [:account_id, :status]
+  end
+end