基于 Lottie 在关键流程中新增全局 Loading 遮罩

引入带引用计数的 GlobalLoadingCenter，通过 RootView 及主要登录/订单/个人中心页面接入，并添加 Loading 动画资源与单元测试。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/Resources/loading.json

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