M5(T-M5-04): onRenderExited 渲染崩溃兜底

- WebSlot.onRenderExited(reason)：渲染子进程异常退出(崩溃/被杀/OOM)时 controller.refresh() 重载恢复，
  重置 firstDone 使重载后重推 appservice/setPostUrl；disposed 守卫避免子游戏销毁期误刷
- BridgeGameContainer：大厅 Web 与子游戏 Web 各挂 .onRenderExited → 对应 slot 恢复
- 防渲染子进程崩溃白屏（框架 §9 内存/崩溃兜底、附录 B 渲染兜底）
devecocli build 通过。
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

entry/src/main/ets/pages/BridgeGameContainer.ets

@@ -189,6 +189,7 @@ export struct BridgeGameContainer {
               this.slotL?.onFirstProgress();
             }
           })
+          .onRenderExited((event: OnRenderExitedEvent) => this.slotL?.onRenderExited(event.renderExitReason))
 
         // 子游戏 Web（临时，subgameUrl 非空时存在）
         if (this.subgameUrl !== '') {
@@ -206,6 +207,7 @@ export struct BridgeGameContainer {
                 this.slotS?.onFirstProgress();
               }
             })
+            .onRenderExited((event: OnRenderExitedEvent) => this.slotS?.onRenderExited(event.renderExitReason))
         }
       }
       .width('100%').height('100%')

entry/src/main/ets/web/WebSlot.ets

@@ -28,6 +28,7 @@ export class WebSlot {
   private registrar: CapabilityRegistrar | undefined = undefined;
   private firstDone: boolean = false;
   private active: boolean;
+  private disposed: boolean = false;
 
   constructor(role: string, controller: webview.WebviewController, active: boolean, uploadServer: LocalUploadServer) {
     this.role = role;
@@ -82,6 +83,21 @@ export class WebSlot {
     this.bridgeCtrl?.onPageEnd();
   }
 
+  /** 渲染子进程退出（崩溃/被杀/OOM）：重载本 Web 恢复，防白屏（T-M5-04）。
+   *  销毁中（子游戏被移除）不重载。重置 firstDone 使重载后重推 appservice/setPostUrl。 */
+  onRenderExited(reason: number): void {
+    if (this.disposed) {
+      return;
+    }
+    WebSlot.log.w(`[${this.role}] render exited (reason=${reason}); reloading`);
+    this.firstDone = false;
+    try {
+      this.controller.refresh();
+    } catch (e) {
+      WebSlot.log.e(`[${this.role}] refresh after render exit failed: ${(e as BusinessError).message}`);
+    }
+  }
+
   /** 页面首次 100%：下发 appservice('1') + setPostUrl（+ 返回大厅待发 getWebdata）。 */
   onFirstProgress(): void {
     if (this.firstDone) {
@@ -142,6 +158,7 @@ export class WebSlot {
 
   /** 销毁（子游戏返回大厅时）。 */
   dispose(): void {
+    this.disposed = true;
     this.registrar?.destroyAll();
     this.bridgeCtrl?.dispose();
     this.adapter?.dispose();