implement square/retrofit like Rectrofit.create() to inject Service

[smoonthsky]

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/// 模拟 Retrofit.create()，通过泛型参数动态生成并注入服务实例
T getService() {
// 如果已经通过 GetX 注册，直接返回单例实例
if (Get.isRegistered()) {
return Get.find();
}
// 如果映射中存在对应的工厂方法，则调用生成服务实例，并注册到 GetX 中
if (_factories.containsKey(T)) {
final service = _factories[T]!() as T;
Get.put(service, permanent: true);
return service;
}
throw Exception("Service factory for type $T not found");
}

annotation support is fine.