Update all admin and vendor API routes to import schemas from canonical module locations instead of legacy re-export files: - messages: use app.modules.messaging.models/schemas - customers: use app.modules.customers.schemas - orders: use app.modules.orders.schemas - inventory: use app.modules.inventory.schemas - invoices: use app.modules.orders.schemas Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>