Restructure omni services and add Chatwoot research snapshot

research/chatwoot/db/migrate/20250108031358_create_captain_inbox.rb

@@ -0,0 +1,11 @@
+class CreateCaptainInbox < ActiveRecord::Migration[7.0]
+  def change
+    create_table :captain_inboxes do |t|
+      t.references :captain_assistant, null: false
+      t.references :inbox, null: false
+      t.timestamps
+    end
+
+    add_index :captain_inboxes, [:captain_assistant_id, :inbox_id], unique: true
+  end
+end