4.B 分享逻辑对齐 daoqi msext：调用即触发 sharesuccess

【契约影响】docs/H5-Native-Contract.md §3.1［2］/§3.2［11］

H5 端 sharesuccess 时机改为"调用 friendsShare handler 即立刻发"，与
原 msext 行为等价（live path 完全不等 SDK / URL Scheme 回包）。用户
明示有意为之：URL Scheme + 剪贴板路径本就没有可靠回包，乐观策略避免
H5 业务卡住。

3 平台分支严格 1:1 对齐 daoqi msext：

WechatShare（对齐 WechatShareManager shareWithContent）
  - type=="2" → 截图 JPEG 0.6 + sendImageData + app icon thumb
  - else      → 链接分享 sendLinkURL + app icon thumb
  - 移除原"远端图"分支（原项目无此分支）
  - 新增 appIconImage helper（读 Info.plist CFBundleIcons，对齐
    [self getAppIconImage]）

QQShare（对齐 QQShareManager shareWithContent + simpleShareToQQFriend）
  - type=="2" → 截图 → UIPasteboard.image → 4 URL Scheme fallback
  - else      → mqqapi://share/to_{fri,qzone}?req_type=1&url=...
                &title=...&description=...（webpageUrl 空时 req_type=0）
  - 不依赖 QQ SDK（CLAUDE.md ADR-006）

DouyinShare（对齐 DouyinShareManager shareWithContent）
  - type=="2" → 截图 → UIPasteboard.image → "立即打开抖音"引导框
  - else      → title+"\n\n"+desc → UIPasteboard.string → 引导框
                双侧空时兜底 "来自进贤聚友棋牌的精彩内容分享"
  - 放弃之前的"存相册 + 自动拉起"激进路径，回到原项目"用户主动点"路径

架构调整：
- SharePlatform.share 改 sync fire-and-forget（去 ShareResult 返回）
- ShareCenter.dispatch / SharePanel.show 去 completion 参数
- FriendsShareHandler：解析后先发 responseCallback("sharefriend")
  与 sharesuccess({success:"2", type:<sharefriend>})，再异步 dispatch

ylgamehall/Source/Share/SharePanel.swift

@@ -27,13 +27,11 @@ public final class SharePanel: UIView {
     private static let animationDuration: TimeInterval = 0.25
 
     private let content: ShareContent
-    private let completion: (ShareResult) -> Void
 
     private let contentView = UIView()
 
-    public init(content: ShareContent, completion: @escaping (ShareResult) -> Void) {
+    public init(content: ShareContent) {
         self.content = content
-        self.completion = completion
         super.init(frame: UIScreen.main.bounds)
         backgroundColor = UIColor(white: 0, alpha: 0)
         setupUI()
@@ -46,13 +44,11 @@ public final class SharePanel: UIView {
 
     // MARK: - 公共入口
 
-    /// 弹出分享面板。任何时候同一个面板只允许一个实例。
-    public static func show(content: ShareContent, completion: @escaping (ShareResult) -> Void) {
-        guard let window = topWindow() else {
-            completion(.failed(reason: "no key window"))
-            return
-        }
-        let panel = SharePanel(content: content, completion: completion)
+    /// 弹出分享面板。fire-and-forget：sharesuccess 已在 FriendsShareHandler 立即触发，
+    /// 用户取消（点空白）或选好平台后不再向 H5 回报结果。
+    public static func show(content: ShareContent) {
+        guard let window = topWindow() else { return }
+        let panel = SharePanel(content: content)
         window.addSubview(panel)
         panel.animateIn()
     }
@@ -146,7 +142,7 @@ public final class SharePanel: UIView {
     @objc private func handleBackgroundTap(_ gesture: UITapGestureRecognizer) {
         let point = gesture.location(in: self)
         if !contentView.frame.contains(point) {
-            dismiss { [self] in completion(.cancelled) }
+            dismiss()
         }
     }
 
@@ -155,12 +151,10 @@ public final class SharePanel: UIView {
         let platform = platforms[sender.tag]
         let scene: ShareScene = content.sharefriend == "2" ? .timeline : .friend
         let snapshotContent = content
-        dismiss {
-            Task { @MainActor in
-                let result = await platform.share(snapshotContent, scene: scene)
-                Self.log.debug("share via \(platform.name, privacy: .public) result=\(String(describing: result), privacy: .public)")
-                self.completion(result)
-            }
+        dismiss { [weak platform] in
+            guard let platform else { return }
+            Self.log.debug("share via \(platform.name, privacy: .public)")
+            platform.share(snapshotContent, scene: scene)
         }
     }
 }