Phase 1.16：SceneDelegate 接 WebContainer + 退役 RootViewController

- SceneDelegate.scene(_:willConnectTo:options:) 中 rootViewController
  从 M0 占位 RootViewController() 改为 WebContainerViewController()
- 删除 ylgamehall/RootViewController.swift（M0 + Phase 1.2–1.13 烟雾测试
  整体退役）；所有 print 验证记录在 git log，留着是死代码
- File System Synchronized Group 自动适应文件删除，无需改 pbxproj
- BuildProject 通过

至此 Phase 1.16 完成；启动链路：
  SceneDelegate → WebContainerViewController.viewDidLoad
    → setupBridgedWebView + setupSplash + registerBridgeHandlers
    → runBootPipeline (ensureReady → fetch → resolve → upgrade → loadFileURL)
    → didFinish 淡出 splash

Plan 进度已勾选（§5 Phase 1.16 + §8）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ylgamehall/SceneDelegate.swift

@@ -14,7 +14,7 @@ final class SceneDelegate: UIResponder, UIWindowSceneDelegate {
                options connectionOptions: UIScene.ConnectionOptions) {
         guard let windowScene = scene as? UIWindowScene else { return }
         let window = UIWindow(windowScene: windowScene)
-        window.rootViewController = RootViewController()
+        window.rootViewController = WebContainerViewController()
         self.window = window
         window.makeKeyAndVisible()
     }