Refactor AppServices into grouped bundles and document DI conventions.

Centralize dependency wiring with Session/Context/Network/UI/Runtime bundles, unify leaf ViewControllers on appServices, and add a test initializer with AppServicesTests.

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

suixinkan_ios/Core/UI/ViewControllerHelpers.swift

@@ -9,8 +9,6 @@ import UIKit
 /// ViewController 通用工具，封装 Toast、Loading 和 ViewModel 绑定。
 @MainActor
 enum ViewControllerHelpers {
-    static var services: AppServices { AppServices.shared }
-
     /// 绑定 ViewModel 的 onChange 回调并在 deinit 时自动清理。
     static func bind(onChange: (() -> Void)?, owner: AnyObject, handler: @escaping () -> Void) {
         onChange?()