feat: stream hashing and archive-entry import support

- Añade `computeHashesFromStream` para hashing desde streams
- Adapta `importDirectory` para procesar entradas internas usando `streamArchiveEntry`
- Añade tests unitarios para hashing por stream e import de entradas de archive

backend/tests/services/importService.archiveEntry.spec.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { Readable } from 'stream';
+
+vi.mock('../../src/services/fsScanner', () => ({ scanDirectory: vi.fn() }));
+vi.mock('../../src/services/archiveReader', () => ({ streamArchiveEntry: 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 { streamArchiveEntry } from '../../src/services/archiveReader';
+import prisma from '../../src/plugins/prisma';
+import { createHash } from 'crypto';
+
+beforeEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe('services/importService (archive entries)', () => {
+  it('procesa una entrada interna usando streamArchiveEntry y hace upsert', async () => {
+    const files = [
+      {
+        path: '/roms/collection.zip::inner/rom1.bin',
+        containerPath: '/roms/collection.zip',
+        entryPath: 'inner/rom1.bin',
+        filename: 'rom1.bin',
+        name: 'inner/rom1.bin',
+        size: 123,
+        format: 'bin',
+        isArchiveEntry: true,
+      },
+    ];
+
+    const data = Buffer.from('import-archive-test');
+
+    (scanDirectory as unknown as vi.Mock).mockResolvedValue(files);
+    (streamArchiveEntry as unknown as vi.Mock).mockResolvedValue(Readable.from([data]));
+
+    (prisma.game.findUnique as unknown as vi.Mock).mockResolvedValue(null);
+    (prisma.game.create as unknown as vi.Mock).mockResolvedValue({
+      id: 77,
+      title: 'ROM1',
+      slug: 'rom1',
+    });
+    (prisma.romFile.upsert as unknown as vi.Mock).mockResolvedValue({ id: 1 });
+
+    const md5 = createHash('md5').update(data).digest('hex');
+
+    const summary = await importDirectory({ dir: '/roms', persist: true });
+
+    expect((streamArchiveEntry as unknown as vi.Mock).mock.calls.length).toBe(1);
+    expect((streamArchiveEntry as unknown as vi.Mock).mock.calls[0][0]).toBe(
+      '/roms/collection.zip'
+    );
+    expect((streamArchiveEntry as unknown as vi.Mock).mock.calls[0][1]).toBe('inner/rom1.bin');
+
+    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 });
+    expect(upsertArgs.create.filename).toBe('rom1.bin');
+    expect(upsertArgs.create.path).toBe('/roms/collection.zip::inner/rom1.bin');
+
+    expect(summary).toEqual({ processed: 1, createdCount: 1, upserted: 1 });
+  });
+});