chore(ci): instalar binarios y documentar dependencias

- Añade sección en README.md con instrucciones para p7zip (7z) y chdman
- Actualiza .gitea/workflows/ci.yaml para intentar instalar p7zip-full y mame-tools/mame (continue-on-error)
- Ajusta importService para validar ruta y pasar logger desde la ruta de import

backend/tests/services/importService.spec.ts

@@ -0,0 +1,79 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('../../src/services/fsScanner', () => ({
+  scanDirectory: vi.fn(),
+}));
+
+vi.mock('../../src/services/checksumService', () => ({
+  computeHashes: vi.fn(),
+}));
+
+vi.mock('../../src/plugins/prisma', () => ({
+  default: {
+    game: { findUnique: vi.fn(), create: vi.fn() },
+    romFile: { upsert: vi.fn() },
+  },
+}));
+
+import { importDirectory, createSlug } from '../../src/services/importService';
+import { scanDirectory } from '../../src/services/fsScanner';
+import { computeHashes } from '../../src/services/checksumService';
+import prisma from '../../src/plugins/prisma';
+
+describe('services/importService', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('exporta createSlug e importDirectory', () => {
+    expect(typeof createSlug).toBe('function');
+    expect(typeof importDirectory).toBe('function');
+  });
+
+  it('cuando hay un archivo y persist:true crea Game y hace romFile.upsert, y devuelve resumen', async () => {
+    const files = [
+      {
+        path: '/roms/Sonic.bin',
+        filename: 'Sonic.bin',
+        name: 'Sonic.bin',
+        size: 123,
+        format: 'bin',
+        isArchive: false,
+      },
+    ];
+
+    const hashes = { size: 123, md5: 'md5-abc', sha1: 'sha1-abc', crc32: 'abcd' };
+
+    (scanDirectory as unknown as vi.Mock).mockResolvedValue(files);
+    (computeHashes as unknown as vi.Mock).mockResolvedValue(hashes);
+
+    (prisma.game.findUnique as unknown as vi.Mock).mockResolvedValue(null);
+    (prisma.game.create as unknown as vi.Mock).mockResolvedValue({
+      id: 77,
+      title: 'Sonic',
+      slug: 'sonic',
+    });
+    (prisma.romFile.upsert as unknown as vi.Mock).mockResolvedValue({ id: 1 });
+
+    const summary = await importDirectory({ dir: '/roms', persist: true });
+
+    expect((scanDirectory as unknown as vi.Mock).mock.calls[0][0]).toBe('/roms');
+    expect((computeHashes as unknown as vi.Mock).mock.calls[0][0]).toBe('/roms/Sonic.bin');
+
+    expect((prisma.game.findUnique as unknown as vi.Mock).mock.calls[0][0]).toEqual({
+      where: { slug: 'sonic' },
+    });
+    expect((prisma.game.create as unknown as vi.Mock).mock.calls[0][0]).toEqual({
+      data: { title: 'Sonic', slug: 'sonic' },
+    });
+
+    expect((prisma.romFile.upsert as unknown as vi.Mock).mock.calls.length).toBe(1);
+    const upsertArgs = (prisma.romFile.upsert as unknown as vi.Mock).mock.calls[0][0];
+    expect(upsertArgs.where).toEqual({ checksum: 'md5-abc' });
+    expect(upsertArgs.create.gameId).toBe(77);
+    expect(upsertArgs.create.filename).toBe('Sonic.bin');
+    expect(upsertArgs.create.hashes).toBe(JSON.stringify(hashes));
+
+    expect(summary).toEqual({ processed: 1, createdCount: 1, upserted: 1 });
+  });
+});