feat: полный бэк и фронт (попытки, разбор, импорт, ИИ, назначения)

- Сервисы: testAttemptService, testAccess, document import/gen/extract, LLM, assignment, aiEditor
- Конфиг: devAuthor, featureFlags; messages/ru; интеграция V.9 (skip без БД)
- API/роуты: app, auth, server; Dockerfile и env example
- Фронт: TestAttempt, TestAttemptReview, AttemptReviewBlock, стили, правки App/api/login/vite
- compose и README; смоук-тесты расширены

Закрывает отсутствие модулей в origin после клона.

Made-with: Cursor

backend/src/services/documentExtractService.test.js

@@ -0,0 +1,33 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  extractTextFromBuffer,
+  resolveDocumentKind,
+} from './documentExtractService.js';
+
+test('resolveDocumentKind: PDF по MIME и по имени', () => {
+  assert.equal(resolveDocumentKind('application/pdf'), 'pdf');
+  assert.equal(resolveDocumentKind('', 'X.PDF'), 'pdf');
+  assert.equal(resolveDocumentKind('application/octet-stream', 'a.pdf'), 'pdf');
+});
+
+test('resolveDocumentKind: docx, txt, неизвестно', () => {
+  assert.equal(
+    resolveDocumentKind(
+      'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
+    ),
+    'docx'
+  );
+  assert.equal(resolveDocumentKind('text/plain', 'x.txt'), 'text');
+  assert.equal(resolveDocumentKind('', 'readme.md'), 'text');
+  assert.equal(resolveDocumentKind('image/png'), null);
+  assert.equal(resolveDocumentKind('application/octet-stream', 'a.exe'), null);
+});
+
+test('extractTextFromBuffer: text UTF-8', async () => {
+  const t = await extractTextFromBuffer(
+    'text',
+    Buffer.from('Проверка D.2', 'utf8')
+  );
+  assert.equal(t, 'Проверка D.2');
+});