fix: add CouchDB mocking to all route tests

- Add comprehensive CouchDB service mocks to all route test files
- Include all required service methods (find, create, update, etc.)
- Add beforeEach cleanup to ensure mock state is reset
- Consistent mocking pattern across all route tests

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

backend/__tests__/routes/rewards.test.js

@@ -1,9 +1,25 @@
 const request = require('supertest');
 const express = require('express');
+
+// Mock CouchDB service before importing routes
+jest.mock('../../services/couchdbService', () => ({
+  initialize: jest.fn().mockResolvedValue(true),
+  create: jest.fn(),
+  getById: jest.fn(),
+  find: jest.fn(),
+  createDocument: jest.fn(),
+  updateDocument: jest.fn(),
+  deleteDocument: jest.fn(),
+  findByType: jest.fn(),
+  findUserById: jest.fn(),
+  update: jest.fn(),
+}));
+
 const rewardsRoutes = require('../../routes/rewards');
 const Reward = require('../../models/Reward');
 const User = require('../../models/User');
 const { createTestUser, createTestReward } = require('../utils/testHelpers');
+const couchdbService = require('../../services/couchdbService');
 
 // Create Express app for testing
 const app = express();
@@ -11,6 +27,9 @@ app.use(express.json());
 app.use('/api/rewards', rewardsRoutes);
 
 describe('Rewards Routes', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
   describe('GET /api/rewards', () => {
     it('should get all rewards', async () => {
       await createTestReward({ name: 'Reward 1', pointsCost: 50 });