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/sales/sales-payments/sales-payments.module.ts

@@ -0,0 +1,19 @@
+import { Module } from '@nestjs/common';
+import { SalesInvoicesModule } from '../sales-invoices/sales-invoices.module';
+import { DocumentCodeService } from '../shared/document-code.service';
+import { SalesPaymentsReadController } from './sales-payments-read.controller';
+import { SalesPaymentsWriteController } from './sales-payments-write.controller';
+import { SalesPaymentsRepository } from './sales-payments.repository';
+import { SalesPaymentsService } from './sales-payments.service';
+
+@Module({
+  imports: [SalesInvoicesModule],
+  controllers: [SalesPaymentsReadController, SalesPaymentsWriteController],
+  providers: [
+    DocumentCodeService,
+    SalesPaymentsRepository,
+    SalesPaymentsService,
+  ],
+  exports: [SalesPaymentsService, DocumentCodeService],
+})
+export class SalesPaymentsModule {}