Phase 2.B：3 项反向 callback 落地（getBattery / getnetwork / appservice）

完成大厅业务期实时状态推送给 H5 的事件驱动链路。每次变化时同时（1）
重写对应 app_*.js 文件供下次 reload，（2）bridge.call 反向推送给当前
页 H5 — 双轨与原 msext 行为等价。

新增 Source/Resource/BatteryMonitor.swift：
  - @MainActor public final class BatteryMonitor，shared 单例 + 幂等 start()
  - 监听 UIDevice.batteryLevelDidChangeNotification + 启动期读首次值
  - currentLevel 同步快照（max(level, 0) 兜底模拟器 -1）+ onChange 回调
  - notification block 内 MainActor.assumeIsolated 安全跨到 main actor

新增 Source/Resource/AppLifecycleObserver.swift：
  - @MainActor public final class AppLifecycleObserver，shared 单例 + 幂等 start()
  - 监听 didEnterBackgroundNotification + willEnterForegroundNotification
  - onBackground / onForeground 双钩子；assumeIsolated 同上

WebContainerViewController.writeAppDataFiles 接入（替换 inline addObserver）：
  - 3 个 monitor 启动统一聚合（NetworkMonitor + BatteryMonitor + AppLifecycle）
  - BatteryMonitor.onChange：writeBattery + bridge.call("getBattery", "%.2f")
  - NetworkMonitor.onChange：writeNetwork + bridge.call("getnetwork", "1"/"2"/"3")
  - AppLifecycle.onBackground/Foreground：bridge.call("appservice", "1"/"2")
  - 首次值改读 BatteryMonitor.currentLevel 而非 UIDevice 原始值

至此 Phase 2.B 全部完成（5 项反向 callback：getphoneinfo / getBattery /
getnetwork / appservice / shakeEnd 全部接好）。

剩 Phase 2.C ExternalSubscriptions 生命周期管理（防双发，栈深 ≥ 2 时
下层不发桥事件）。

BuildProject 通过

Plan §5 Phase 2.B 全部勾选

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

ylgamehall/Source/Resource/AppLifecycleObserver.swift

@@ -0,0 +1,49 @@
+//
+//  AppLifecycleObserver.swift
+//  ylgamehall
+//
+//  监听 UIApplication 前/后台切换通知，提供 onBackground / onForeground 钩子。
+//
+//  契约：docs/H5-Native-Contract.md §3.2 ［4］appservice 反向 callback
+//    "1" = 进入后台 / "2" = 回到前台（命名错位沿用历史）
+//  Phase 2.11
+//
+
+import UIKit
+
+@MainActor
+public final class AppLifecycleObserver {
+
+    public static let shared = AppLifecycleObserver()
+
+    public var onBackground: (@MainActor () -> Void)?
+    public var onForeground: (@MainActor () -> Void)?
+
+    private var started = false
+
+    public init() {}
+
+    public func start() {
+        guard !started else { return }
+        started = true
+        let nc = NotificationCenter.default
+        nc.addObserver(
+            forName: UIApplication.didEnterBackgroundNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.onBackground?()
+            }
+        }
+        nc.addObserver(
+            forName: UIApplication.willEnterForegroundNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.onForeground?()
+            }
+        }
+    }
+}

ylgamehall/Source/Resource/BatteryMonitor.swift

@@ -0,0 +1,49 @@
+//
+//  BatteryMonitor.swift
+//  ylgamehall
+//
+//  UIDevice.batteryLevelDidChangeNotification 的最简 wrap：
+//  提供 currentLevel 同步快照 + onChange 主线程回调。
+//
+//  契约：docs/H5-Native-Contract.md §3.2 ［2］getBattery 反向 callback
+//  Phase 2.9
+//
+
+import UIKit
+
+@MainActor
+public final class BatteryMonitor {
+
+    public static let shared = BatteryMonitor()
+
+    /// 当前电量 0.0…1.0；模拟器无电池硬件返回 -1，BatteryMonitor.start() 后兜底为 0
+    public private(set) var currentLevel: Float = 0
+
+    /// 电量变化回调（主线程触发）
+    public var onChange: (@MainActor (Float) -> Void)?
+
+    private var started = false
+
+    public init() {}
+
+    public func start() {
+        guard !started else { return }
+        started = true
+        UIDevice.current.isBatteryMonitoringEnabled = true
+        currentLevel = max(UIDevice.current.batteryLevel, 0)
+        NotificationCenter.default.addObserver(
+            forName: UIDevice.batteryLevelDidChangeNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            // forName: + queue: .main 的 block 闭包在 main 队列触发；
+            // 用 MainActor.assumeIsolated 把它桥到 main actor 隔离
+            MainActor.assumeIsolated {
+                guard let self else { return }
+                let level = max(UIDevice.current.batteryLevel, 0)
+                self.currentLevel = level
+                self.onChange?(level)
+            }
+        }
+    }
+}