实现快传，完善快传和网盘的功能，实现文件的互传等一系列功能

front/src/lib/transfer-archive.test.ts

@@ -0,0 +1,34 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  buildTransferArchiveFileName,
+  createTransferZipArchive,
+} from './transfer-archive';
+
+test('buildTransferArchiveFileName always returns a zip filename', () => {
+  assert.equal(buildTransferArchiveFileName('课堂资料'), '课堂资料.zip');
+  assert.equal(buildTransferArchiveFileName('课堂资料.zip'), '课堂资料.zip');
+});
+
+test('createTransferZipArchive creates a zip payload that keeps nested file paths', async () => {
+  const archive = await createTransferZipArchive([
+    {
+      name: 'report.pdf',
+      relativePath: '课程资料/report.pdf',
+      data: new TextEncoder().encode('report'),
+    },
+    {
+      name: 'notes.txt',
+      relativePath: '课程资料/notes.txt',
+      data: new TextEncoder().encode('notes'),
+    },
+  ]);
+
+  const bytes = new Uint8Array(await archive.arrayBuffer());
+  const text = new TextDecoder().decode(bytes);
+
+  assert.equal(String.fromCharCode(...bytes.slice(0, 4)), 'PK\u0003\u0004');
+  assert.match(text, /课程资料\/report\.pdf/);
+  assert.match(text, /课程资料\/notes\.txt/);
+});