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

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

backend/__tests__/routes/auth.test.js

@@ -1,8 +1,20 @@
-// Mock CouchDB service for testing
-jest.mock('../../services/couchdbService');
-
 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 authRoutes = require('../../routes/auth');
 const User = require('../../models/User');
 const couchdbService = require('../../services/couchdbService');