feat: Add new modules and services for stocks, transactions, and products

This commit introduces new nest.js modules for stocks, transactions and products, along with their respective services and controllers. These provide foundation for further feature development in these areas.

src/products/products.controller.ts

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+import { Controller } from '@nestjs/common';
+
+@Controller('products')
+export class ProductsController {}

src/products/products.module.ts

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+import { Module } from '@nestjs/common';
+import { ProductsController } from './products.controller';
+import { ProductsService } from './products.service';
+
+@Module({
+  controllers: [ProductsController],
+  providers: [ProductsService]
+})
+export class ProductsModule {}

src/products/products.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class ProductsService {}

src/stocks/stocks.controller.ts

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+import { Controller } from '@nestjs/common';
+
+@Controller('stocks')
+export class StocksController {}

src/stocks/stocks.module.ts

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+import { Module } from '@nestjs/common';
+import { StocksController } from './stocks.controller';
+import { StocksService } from './stocks.service';
+
+@Module({
+  controllers: [StocksController],
+  providers: [StocksService]
+})
+export class StocksModule {}

src/stocks/stocks.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class StocksService {}

src/transactions/transactions.controller.ts

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+import { Controller } from '@nestjs/common';
+
+@Controller('transactions')
+export class TransactionsController {}

src/transactions/transactions.module.ts

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+import { Module } from '@nestjs/common';
+import { TransactionsController } from './transactions.controller';
+import { TransactionsService } from './transactions.service';
+
+@Module({
+  controllers: [TransactionsController],
+  providers: [TransactionsService]
+})
+export class TransactionsModule {}

src/transactions/transactions.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class TransactionsService {}