feat: WebView/媒体/红包详情全量实现 (#25~#30)

#25 MiniAppWebViewPage + MiniAppRouter
  - webview_flutter 加载 {apiBaseUrl}/miniapp/{appId}/index.html?gameId=...&token=...
  - MiniAppFloatButton 接收 chatId/chatType，默认打开 WebView
  - BannerState 新增 appId 字段，由 GameBannerData.appId 填充

#26 open_filex 文件打开
  - FileMessageBubble 下载完成后调用 OpenFilex.open(localPath)
  - 打开失败时 SnackBar 提示

#27 audioplayers 音频播放
  - AudioPlaybackService(Notifier)：单例 AudioPlayer，togglePlay/pause/seek
  - AudioMessageBubble 接入：播放态图标切换、进度 mm:ss 显示

#28 video_player + chewie 视频全屏
  - VideoPlayerPage：本地文件 / HTTP 双模，chewie 控制栏
  - VideoMessageBubble 默认 onTap → push VideoPlayerPage

#29 红包领取排行榜详情页
  - GET /payment/rp/detail → RpDetailData + RpRecordItem DTO
  - GetRpDetailUseCase + getRpDetailUseCaseProvider
  - RedEnvelopeDetailSheet：汇总行 + 领取排行列表，头像/昵称/金额/时间

#30 MINE_RP 地雷红包发包 UI
  - _RpType 新增 mine(MINE_RP)，显示地雷金额输入框
  - SendRpRequest.parameters 携带 mineAmount
  - RedEnvelopeBubble：非活跃状态直接打开详情，活跃状态领取后打开排行榜

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/im_app/lib/data/remote/red_envelope_request.dart

@@ -18,7 +18,7 @@ class SendRpData {
 
 /// 发送红包请求
 ///
-/// 对应 Gitea issue #19 + #22
+/// 对应 Gitea issue #19 + #22 + #30
 ///
 /// ## currencyType 规则（#19 bug fix）
 ///
@@ -26,6 +26,10 @@ class SendRpData {
 /// Flutter 修复：`currencyType` 由调用方传入，UseCase 层根据 workspaceId 动态决定：
 /// - workspaceId > 0 → 从 `/workspace/workspace/get` 取 workspace.currency
 /// - workspaceId == 0 → 默认 `"PEA"`
+///
+/// ## mineAmount（#30 MINE_RP）
+///
+/// 地雷红包时附带 `mineAmount` 参数，null 时不传。
 class SendRpRequest extends ApiRequestable<SendRpData> {
   final String amount;
   final String currencyType;
@@ -36,6 +40,7 @@ class SendRpRequest extends ApiRequestable<SendRpData> {
   final int rpNum;
   final String remark;
   final int msgSendTime;
+  final String? mineAmount;
 
   const SendRpRequest({
     required this.amount,
@@ -47,6 +52,7 @@ class SendRpRequest extends ApiRequestable<SendRpData> {
     required this.rpNum,
     required this.remark,
     required this.msgSendTime,
+    this.mineAmount,
   });
 
   @override
@@ -66,6 +72,8 @@ class SendRpRequest extends ApiRequestable<SendRpData> {
         'rpNum': rpNum,
         'remark': remark,
         'msgSendTime': msgSendTime,
+        if (mineAmount != null && mineAmount!.isNotEmpty)
+          'mineAmount': mineAmount,
       };
 
   @override
@@ -268,6 +276,107 @@ class WorkspaceData {
   }
 }
 
+// ── 红包领取详情 ───────────────────────────────────────────────────────────────
+
+/// 单条领取记录
+class RpRecordItem {
+  final int userId;
+  final String nickname;
+  final String avatarUrl;
+  final String amount;
+  final int grabTime;
+
+  const RpRecordItem({
+    required this.userId,
+    required this.nickname,
+    required this.avatarUrl,
+    required this.amount,
+    required this.grabTime,
+  });
+
+  factory RpRecordItem.fromJson(Map<String, dynamic> json) {
+    return RpRecordItem(
+      userId: json['userId'] as int? ?? 0,
+      nickname: json['nickname'] as String? ?? '',
+      avatarUrl: json['avatarUrl'] as String? ?? '',
+      amount: (json['amount'] ?? '0').toString(),
+      grabTime: json['grabTime'] as int? ?? 0,
+    );
+  }
+}
+
+/// 红包领取详情响应
+///
+/// 对应 Gitea issue #29
+class RpDetailData {
+  final String rpId;
+  final String rpType;
+  final String remark;
+  final String totalAmount;
+  final int totalNum;
+  final String receivedAmount;
+  final int receivedNum;
+  final int status;
+  final List<RpRecordItem> records;
+
+  const RpDetailData({
+    required this.rpId,
+    required this.rpType,
+    required this.remark,
+    required this.totalAmount,
+    required this.totalNum,
+    required this.receivedAmount,
+    required this.receivedNum,
+    required this.status,
+    required this.records,
+  });
+
+  factory RpDetailData.fromJson(Map<String, dynamic> json) {
+    final raw = json['records'];
+    final records = raw is List
+        ? raw.whereType<Map<String, dynamic>>().map(RpRecordItem.fromJson).toList()
+        : <RpRecordItem>[];
+    return RpDetailData(
+      rpId: json['rpId'] as String? ?? '',
+      rpType: json['rpType'] as String? ?? '',
+      remark: json['remark'] as String? ?? '恭喜发财',
+      totalAmount: (json['totalAmount'] ?? '0').toString(),
+      totalNum: json['totalNum'] as int? ?? 0,
+      receivedAmount: (json['receivedAmount'] ?? '0').toString(),
+      receivedNum: json['receivedNum'] as int? ?? 0,
+      status: json['status'] as int? ?? 0,
+      records: records,
+    );
+  }
+}
+
+/// 获取红包领取详情请求
+///
+/// GET /payment/rp/detail?rpId=xxx
+class GetRpDetailRequest extends ApiRequestable<RpDetailData> {
+  final String rpId;
+
+  const GetRpDetailRequest({required this.rpId});
+
+  @override
+  String get path => ApiPaths.rpDetail;
+
+  @override
+  HttpMethod get method => HttpMethod.get;
+
+  @override
+  Map<String, dynamic> get parameters => {'rpId': rpId};
+
+  @override
+  RpDetailData? decodeResponse(dynamic response) {
+    final data = (response as dynamic).data;
+    if (data is! Map<String, dynamic>) return null;
+    return RpDetailData.fromJson(data);
+  }
+}
+
+// ── Workspace ─────────────────────────────────────────────────────────────────
+
 /// 获取 Workspace 信息请求
 class GetWorkspaceRequest extends ApiRequestable<WorkspaceData> {
   final int workspaceId;