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.

src/modules/configuration/configuration.module.ts

@@ -3,9 +3,22 @@ import { BranchesModule } from './branches/branches.module';
 import { CustomersModule } from './customers/customers.module';
 import { DivisionsModule } from './divisions/divisions.module';
 import { EmployeesModule } from './employees/employees.module';
+import { ProductsModule } from './products/products.module';
 
 @Module({
-  imports: [DivisionsModule, BranchesModule, CustomersModule, EmployeesModule],
-  exports: [DivisionsModule, BranchesModule, CustomersModule, EmployeesModule],
+  imports: [
+    DivisionsModule,
+    BranchesModule,
+    CustomersModule,
+    EmployeesModule,
+    ProductsModule,
+  ],
+  exports: [
+    DivisionsModule,
+    BranchesModule,
+    CustomersModule,
+    EmployeesModule,
+    ProductsModule,
+  ],
 })
 export class ConfigurationModule {}