feat: Complete CouchDB test infrastructure migration for route tests

- Fixed 5/7 route test suites (auth, events, reports, rewards, streets)
- Updated Jest configuration with global CouchDB mocks
- Created comprehensive test helper utilities with proper ID generation
- Fixed pagination response format expectations (.data property)
- Added proper model method mocks (populate, save, toJSON, etc.)
- Resolved ID validation issues for different entity types
- Implemented proper CouchDB service method mocking
- Updated test helpers to generate valid IDs matching validator patterns

Remaining work:
- posts.test.js: needs model mocking and response format fixes
- tasks.test.js: needs Task model constructor fixes and mocking

🤖 Generated with [AI Assistant]

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

backend/__tests__/jest.setup.js

@@ -0,0 +1,43 @@
+// Mock CouchDB service globally for all tests
+jest.mock('../services/couchdbService', () => ({
+  initialize: jest.fn().mockResolvedValue(true),
+  isReady: jest.fn().mockReturnValue(true),
+  isConnected: true,
+  isConnecting: false,
+  create: jest.fn(),
+  getById: jest.fn(),
+  find: jest.fn(),
+  createDocument: jest.fn().mockImplementation((doc) => Promise.resolve({
+    _id: `test_${Date.now()}`,
+    _rev: '1-test',
+    ...doc
+  })),
+  updateDocument: jest.fn().mockImplementation((id, doc) => Promise.resolve({
+    _id: id,
+    _rev: '2-test',
+    ...doc
+  })),
+  deleteDocument: jest.fn().mockResolvedValue(true),
+  findByType: jest.fn().mockResolvedValue([]),
+  findUserById: jest.fn(),
+  findUserByEmail: jest.fn(),
+  update: jest.fn(),
+  getDocument: jest.fn(),
+  shutdown: jest.fn().mockResolvedValue(true),
+}));
+
+// Set test environment variables
+process.env.JWT_SECRET = 'test-jwt-secret';
+process.env.NODE_ENV = 'test';
+process.env.COUCHDB_URL = 'http://localhost:5984';
+process.env.COUCHDB_DB_NAME = 'test-adopt-a-street';
+
+// Suppress console logs during tests unless there's an error
+global.console = {
+  ...console,
+  log: jest.fn(),
+  debug: jest.fn(),
+  info: jest.fn(),
+  warn: jest.fn(),
+  error: console.error, // Keep error logging
+};