Replace CYLTabBarController with native UITabBarController for main tabs.

Use a system scan tab slot with MainScanTabItem interception so scanner presentation no longer depends on CYL PlusButton, and remove the CYLTabBarController pod dependency.

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

suixinkan_ios/App/Navigation/AppTab.swift

@@ -66,6 +66,7 @@ enum AppTab: String, CaseIterable, Identifiable, Hashable {
             image: unselectedImage,
             selectedImage: selectedImage
         )
+        item.accessibilityIdentifier = "main.tab.\(rawValue)"
         return item
     }
 

suixinkan_ios/App/ViewControllers/RootViewController.swift

@@ -106,7 +106,7 @@ final class RootViewController: UIViewController {
         }
     }
 
-    /// 登录后将 `MainTabBarController` 设为 window 根控制器，满足 CYLTabBarController 挂载要求。
+    /// 登录后将 `MainTabBarController` 设为 window 根控制器。
     private func showMainTabBarAsWindowRoot() {
         removeCurrentAuthChild()