feat: update projects API to include display names

- Modified projects API route to return objects with name and displayName fields
- Added comprehensive tests for the updated API response structure
- Tests verify display name mapping and error handling
- All existing tests continue to pass

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

app/api/__tests__/projects.test.ts

@@ -0,0 +1,41 @@
+/**
+ * @jest-environment node
+ */
+
+import { GET } from '../projects/route';
+import { getProjects } from '@/lib/fs-utils';
+
+jest.mock('@/lib/fs-utils');
+jest.mock('@/lib/utils', () => ({
+  getProjectDisplayName: jest.fn((name) => name === 'FT' ? '外放构建' : name),
+}));
+
+describe('/api/projects', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should return projects with display names', async () => {
+    (getProjects as jest.Mock).mockResolvedValue(['FT', 'FT_DEV', 'UNKNOWN']);
+
+    const response = await GET();
+    const data = await response.json();
+
+    expect(response.status).toBe(200);
+    expect(data).toEqual([
+      { name: 'FT', displayName: '外放构建' },
+      { name: 'FT_DEV', displayName: 'FT_DEV' },
+      { name: 'UNKNOWN', displayName: 'UNKNOWN' },
+    ]);
+  });
+
+  it('should handle errors gracefully', async () => {
+    (getProjects as jest.Mock).mockRejectedValue(new Error('File system error'));
+
+    const response = await GET();
+    const data = await response.json();
+
+    expect(response.status).toBe(500);
+    expect(data.error).toBe('Failed to fetch projects');
+  });
+});