feat(nestjs-notifications): add auth-notification bridge and demo e2e tests

Connect nestjs-auth with nestjs-notifications via EventEmitter pattern:
- Add AUTH_EVENTS constants and typed event interfaces in nestjs-auth
- Add AuthNotificationModule with listener for auth events (verify-email, welcome, password-reset)
- Add isGlobal support to NotificationModule for cross-module provider access
- Add event-emitter as optional peer dependency in nestjs-notifications
- Add comprehensive e2e test suite (34 tests) for demo app with Docker orchestration
- Add unit tests for event emission and auth notification listener

Author: JonatanSalas

apps/demo/jest.e2e.config.ts

@@ -0,0 +1,14 @@
+import type { Config } from 'jest';
+
+const config: Config = {
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  rootDir: '.',
+  testRegex: '.e2e-spec.ts$',
+  transform: {
+    '^.+\\.ts$': 'ts-jest',
+  },
+  testEnvironment: 'node',
+  testTimeout: 30000,
+};
+
+export default config;