feat(mobile): 区分移动端token存储键名并添加Playwright测试

修改mobile端token存储键名为'mobile_token'以区分不同客户端
添加Playwright测试套件用于知识库管理功能测试
更新.gitignore忽略node_modules和test-results目录

client/mobile/hooks.tsx

@@ -27,7 +27,7 @@ const ThemeContext = createContext<ThemeContextType | null>(null);
 // 认证提供者组件
 export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
   const [user, setUser] = useState<User | null>(null);
-  const [token, setToken] = useState<string | null>(getLocalStorageWithExpiry('token'));
+  const [token, setToken] = useState<string | null>(getLocalStorageWithExpiry('mobile_token'));
   const [isAuthenticated, setIsAuthenticated] = useState(false);
   const queryClient = useQueryClient();