feat: add AccountsModule with list and QR endpoints

Implements GET /accounts (list all accounts) and GET /accounts/:id/qr
(returns QR code as base64 data URL) using the qrcode package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/modules/accounts/accounts.controller.spec.ts

@@ -0,0 +1,36 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AccountsController } from './accounts.controller';
+import { AccountsService } from './accounts.service';
+
+const mockAccounts = [
+  { id: 'acc_1', platform: 'whatsapp', jid: '111@s.whatsapp.net', displayName: 'Test', status: 'ACTIVE' },
+];
+const mockService = {
+  list: jest.fn().mockResolvedValue(mockAccounts),
+  getQr: jest.fn().mockResolvedValue({ status: 'DISCONNECTED', qrDataUrl: 'data:image/png;base64,fake' }),
+};
+
+describe('AccountsController', () => {
+  let controller: AccountsController;
+
+  beforeEach(async () => {
+    jest.clearAllMocks();
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [AccountsController],
+      providers: [{ provide: AccountsService, useValue: mockService }],
+    }).compile();
+    controller = module.get<AccountsController>(AccountsController);
+  });
+
+  it('list() returns accounts from service', async () => {
+    const result = await controller.list();
+    expect(result).toEqual(mockAccounts);
+    expect(mockService.list).toHaveBeenCalled();
+  });
+
+  it('getQr() calls service with the account id', async () => {
+    const result = await controller.getQr('acc_1');
+    expect(mockService.getQr).toHaveBeenCalledWith('acc_1');
+    expect(result.qrDataUrl).toBe('data:image/png;base64,fake');
+  });
+});

apps/api/src/modules/accounts/accounts.controller.ts

@@ -0,0 +1,17 @@
+import { Controller, Get, Param } from '@nestjs/common';
+import { AccountsService } from './accounts.service';
+
+@Controller('accounts')
+export class AccountsController {
+  constructor(private readonly service: AccountsService) {}
+
+  @Get()
+  list() {
+    return this.service.list();
+  }
+
+  @Get(':id/qr')
+  getQr(@Param('id') id: string) {
+    return this.service.getQr(id);
+  }
+}

apps/api/src/modules/accounts/accounts.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { AccountsController } from './accounts.controller';
+import { AccountsService } from './accounts.service';
+
+@Module({
+  controllers: [AccountsController],
+  providers: [AccountsService],
+})
+export class AccountsModule {}

apps/api/src/modules/accounts/accounts.service.spec.ts

@@ -0,0 +1,66 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AccountsService } from './accounts.service';
+import { PrismaService } from '../../prisma/prisma.service';
+import * as QRCode from 'qrcode';
+
+jest.mock('qrcode', () => ({
+  toDataURL: jest.fn().mockResolvedValue('data:image/png;base64,fakedata'),
+}));
+
+const mockAccounts = [
+  { id: 'acc_1', platform: 'whatsapp', jid: '111@s.whatsapp.net', displayName: 'Test Account', status: 'ACTIVE' },
+];
+
+const mockPrisma = {
+  account: {
+    findMany: jest.fn().mockResolvedValue(mockAccounts),
+    findUnique: jest.fn(),
+  },
+};
+
+describe('AccountsService', () => {
+  let service: AccountsService;
+
+  beforeEach(async () => {
+    jest.clearAllMocks();
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        AccountsService,
+        { provide: PrismaService, useValue: mockPrisma },
+      ],
+    }).compile();
+    service = module.get<AccountsService>(AccountsService);
+  });
+
+  describe('list()', () => {
+    it('returns accounts from Prisma without qrCode field', async () => {
+      const result = await service.list();
+      expect(result).toEqual(mockAccounts);
+      expect(mockPrisma.account.findMany).toHaveBeenCalledWith(
+        expect.objectContaining({ select: expect.not.objectContaining({ qrCode: true }) }),
+      );
+    });
+  });
+
+  describe('getQr()', () => {
+    it('returns null qrDataUrl when account has no qrCode', async () => {
+      mockPrisma.account.findUnique.mockResolvedValue({ status: 'ACTIVE', qrCode: null });
+      const result = await service.getQr('acc_1');
+      expect(result).toEqual({ status: 'ACTIVE', qrDataUrl: null });
+      expect(QRCode.toDataURL).not.toHaveBeenCalled();
+    });
+
+    it('converts qrCode string to data URL when qrCode is present', async () => {
+      mockPrisma.account.findUnique.mockResolvedValue({ status: 'DISCONNECTED', qrCode: 'raw-qr-string' });
+      const result = await service.getQr('acc_1');
+      expect(QRCode.toDataURL).toHaveBeenCalledWith('raw-qr-string');
+      expect(result).toEqual({ status: 'DISCONNECTED', qrDataUrl: 'data:image/png;base64,fakedata' });
+    });
+
+    it('returns not_found status when account does not exist', async () => {
+      mockPrisma.account.findUnique.mockResolvedValue(null);
+      const result = await service.getQr('nonexistent');
+      expect(result).toEqual({ status: 'not_found', qrDataUrl: null });
+    });
+  });
+});

apps/api/src/modules/accounts/accounts.service.ts

@@ -0,0 +1,39 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '../../prisma/prisma.service';
+import * as QRCode from 'qrcode';
+
+export interface AccountSummary {
+  id: string;
+  platform: string;
+  jid: string;
+  displayName: string | null;
+  status: string;
+}
+
+export interface AccountQr {
+  status: string;
+  qrDataUrl: string | null;
+}
+
+@Injectable()
+export class AccountsService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  list(): Promise<AccountSummary[]> {
+    return this.prisma.account.findMany({
+      orderBy: { createdAt: 'asc' },
+      select: { id: true, platform: true, jid: true, displayName: true, status: true },
+    });
+  }
+
+  async getQr(id: string): Promise<AccountQr> {
+    const account = await this.prisma.account.findUnique({
+      where: { id },
+      select: { status: true, qrCode: true },
+    });
+    if (!account) return { status: 'not_found', qrDataUrl: null };
+    if (!account.qrCode) return { status: account.status, qrDataUrl: null };
+    const qrDataUrl = await QRCode.toDataURL(account.qrCode);
+    return { status: account.status, qrDataUrl };
+  }
+}