M3(T-M3-13): 分享面板对齐原工程——微信SDK + QQ/抖音系统分享

对齐 Android SharePanelHelper 流程：H5 friendsSharetypeUrlToptitleDescript →
原生弹自定义面板(微信/QQ/抖音) → 按所选平台分享。

- common ShareEvents：SHOW_PANEL + SharePanelRequest/Result；ShareProvider 经一次性
  resultEvent 与 entry 容器一对一解耦（双槽实例隔离，避免广播串扰）
- ShareProvider 重构：微信走 SDK（type2 Canvas截图→WXImageObject / 其他→WXWebpageObject；
  scene 好友/朋友圈；回传 sharesuccess）；QQ/抖音走 @kit.ShareKit 系统分享(文本/图片/链接/视频，
  不集成对应 SDK、不回传)；截图失败统一降级
- 截图：CapabilityContext.captureCanvas（WebSlot 用 controller.runJavaScript 取 canvas
  toDataURL，非激活/出错返回空）；FileSystem.writeBytes 落盘；fileUri 给 WXImageObject/系统分享
- entry SharePanel 组件 + BridgeGameContainer 顶层叠加；重复面板/销毁均取消回投防 once 悬挂

真机验证项：微信开放平台注册后的真分享、系统分享面板拉起、canvas 截图

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

common/Index.ets

@@ -6,6 +6,8 @@ export { BridgeTracer } from './src/main/ets/log/BridgeTracer';
 export { EventBus, EventPayload } from './src/main/ets/event/EventBus';
 export { NavEvents, OpenGenericWebPayload, SwitchGamePayload, BackGamePayload }
   from './src/main/ets/event/NavEvents';
+export { ShareEvents, SharePanelRequest, SharePanelResult }
+  from './src/main/ets/event/ShareEvents';
 export { DIContainer, Factory } from './src/main/ets/di/DIContainer';
 export { ErrorCenter, ErrorStrategy, ErrorSink } from './src/main/ets/error/ErrorCenter';
 export { AppEnv } from './src/main/ets/env/AppEnv';