Add products and sales management modules with database schema and validation

- Introduced `ProductsModule` to manage product data, including read and write controllers.
- Created database migrations for the `products`, `sales_requests`, `sales_orders`, `sales_invoices`, and related tables, including constraints and unique indexes.
- Implemented validation for product fields such as code, name, unit, and brand with corresponding utility functions.
- Developed service and repository layers for handling product and sales data operations.
- Added unit tests for the products and sales services, repositories, and controllers to ensure functionality and correctness.
- Updated application module to include the new `ProductsModule` and related sales modules for better organization.

drizzle/migrations/meta/_journal.json

@@ -57,6 +57,27 @@
       "when": 1787555000000,
       "tag": "0007_employees",
       "breakpoints": true
+    },
+    {
+      "idx": 8,
+      "version": "7",
+      "when": 1787556000000,
+      "tag": "0008_products",
+      "breakpoints": true
+    },
+    {
+      "idx": 9,
+      "version": "7",
+      "when": 1787557000000,
+      "tag": "0009_sales",
+      "breakpoints": true
+    },
+    {
+      "idx": 10,
+      "version": "7",
+      "when": 1787558000000,
+      "tag": "0010_phase2_shape",
+      "breakpoints": true
     }
   ]
 }