fix: remove unused AuthManager import and merge from main

- Remove unused AuthManager import from auth-plugin.test.ts
- Merge latest changes from main branch

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/021c7504-f94b-4009-bc35-fb44d8348988

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

packages/plugins/plugin-auth/src/auth-plugin.test.ts

@@ -2,7 +2,6 @@
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { AuthPlugin } from './auth-plugin';
-import { AuthManager } from './auth-manager';
 import type { PluginContext } from '@objectstack/core';
 
 describe('AuthPlugin', () => {