Add Playwright tests for contacts API and cleanup duplicate config files

backend/tests/contacts.spec.js

@@ -0,0 +1,28 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Contacts API', () => {
+  test('should get contacts (unauthenticated)', async ({ request }) => {
+    const response = await request.get('/contacts');
+    
+    // Should return 401 for unauthorized access
+    expect(response.status()).toBe(401);
+  });
+
+  test('should validate contact data on creation', async ({ request }) => {
+    const invalidContact = {
+      name: '',
+      email: 'invalid-email',
+      phone: ''
+    };
+
+    const response = await request.post('/contacts', {
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      data: invalidContact
+    });
+
+    // Should return 400 for invalid data
+    expect(response.status()).toBe(400);
+  });
+});