feat(catalogues): integrate UOM master system with dynamic unit validation

refactor: change supplier_id, client_id, and warehouse_id to UUID in models and migration

feat(sync): Implement warehouse synchronization from MongoDB to PostgreSQL

Refactor COUNT queries to use COUNT(1) for improved performance and consistency across various scripts and services.

merchant fixes

feat(catalogues/pricing): standardize pricing level keys to lowercase format

refactor(database): reorganize database scripts and examples into docs directory