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
     }