Add Machine module with controller, service, and tests

Implemented the MachineModule along with its corresponding MachineController and MachineService classes. Added unit tests for both the controller and service to ensure they are correctly instantiated and defined.

apps/backend/src/app/machine/machine.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { MachineController } from './machine.controller';
+import { MachineService } from './machine.service';
+
+describe('MachineController', () => {
+  let controller: MachineController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [MachineController],
+      providers: [MachineService],
+    }).compile();
+
+    controller = module.get<MachineController>(MachineController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

apps/backend/src/app/machine/machine.controller.ts

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+import { Controller } from '@nestjs/common';
+import { MachineService } from './machine.service';
+
+@Controller('machine')
+export class MachineController {
+  constructor(private readonly machineService: MachineService) {}
+}

apps/backend/src/app/machine/machine.module.ts

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+import { Module } from '@nestjs/common';
+import { MachineService } from './machine.service';
+import { MachineController } from './machine.controller';
+
+@Module({
+  controllers: [MachineController],
+  providers: [MachineService],
+})
+export class MachineModule {}

apps/backend/src/app/machine/machine.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { MachineService } from './machine.service';
+
+describe('MachineService', () => {
+  let service: MachineService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [MachineService],
+    }).compile();
+
+    service = module.get<MachineService>(MachineService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

apps/backend/src/app/machine/machine.service.ts

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