feat(widget): 添加连麦卡片模型和视频通话小窗组件

- 创建 LinkMicCardModel 类用于连麦卡片数据结构
- 实现连麦卡片模型的 JSON 序列化和反序列化
- 添加 VideoCallOverlayWidget 组件用于视频通话小窗显示
- 实现小窗拖拽和边缘吸附功能
- 集成通话时长显示和用户信息展示
- 添加点击小窗返回视频通话页面的功能

lib/model/rtc/link_mic_card_model.dart

@@ -0,0 +1,35 @@
+/// 连麦卡片模型
+class LinkMicCardModel {
+  final int type;
+  final int num;
+  final int? unitSellingPrice;
+
+  LinkMicCardModel({
+    required this.type,
+    required this.num,
+    this.unitSellingPrice,
+  });
+
+  factory LinkMicCardModel.fromJson(Map<String, dynamic> json) {
+    
+    return LinkMicCardModel(
+      type: json['type'] as int? ?? 0,
+      num: json['num'] as int? ?? 0,
+      unitSellingPrice: json['unitSellingPrice'] as int? ?? 0,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'type': type,
+      'num': num,
+      'unitSellingPrice': unitSellingPrice,
+    };
+  }
+
+  @override
+  String toString() {
+    return 'LinkMicCardModel(type: $type, num: $num, unitSellingPrice: $unitSellingPrice)';
+  }
+}
+

lib/widget/message/video_call_overlay_widget.dart

@@ -0,0 +1,195 @@
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:dating_touchme_app/controller/message/call_manager.dart';
+import 'package:dating_touchme_app/extension/ex_widget.dart';
+import 'package:dating_touchme_app/generated/assets.dart';
+import 'package:dating_touchme_app/pages/message/video_call_page.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:get/get.dart';
+
+/// 视频通话小窗组件
+class VideoCallOverlayWidget extends StatefulWidget {
+  final VoidCallback? onClose;
+  final String targetUserId;
+  final String? targetUserName;
+  final String? targetAvatarUrl;
+
+  const VideoCallOverlayWidget({
+    super.key,
+    this.onClose,
+    required this.targetUserId,
+    this.targetUserName,
+    this.targetAvatarUrl,
+  });
+
+  @override
+  State<VideoCallOverlayWidget> createState() => _VideoCallOverlayWidgetState();
+}
+
+class _VideoCallOverlayWidgetState extends State<VideoCallOverlayWidget> {
+  Offset _position = Offset.zero;
+  bool _isDragging = false;
+  final CallManager _callManager = CallManager.instance;
+
+  @override
+  void initState() {
+    super.initState();
+    // 初始位置设置为右上角
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final size = MediaQuery.of(context).size;
+      setState(() {
+        _position = Offset(
+          size.width - 100.w,
+          100,
+        );
+      });
+    });
+  }
+
+  /// 吸附到边缘
+  void _snapToEdge(double screenWidth) {
+    final centerX = screenWidth / 2;
+    final targetX = _position.dx < centerX
+        ? 0.0
+        : screenWidth - 100.w;
+
+    setState(() {
+      _position = Offset(targetX, _position.dy);
+      _isDragging = false;
+    });
+  }
+
+  /// 格式化通话时长
+  String _formatDuration(int seconds) {
+    String twoDigits(int n) => n.toString().padLeft(2, '0');
+    final minutes = twoDigits(seconds ~/ 60);
+    final secs = twoDigits(seconds % 60);
+    return '$minutes:$secs';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final screenSize = MediaQuery.of(context).size;
+
+    return AnimatedPositioned(
+      duration: _isDragging
+          ? const Duration(milliseconds: 50)
+          : const Duration(milliseconds: 300),
+      curve: _isDragging ? Curves.linear : Curves.easeOut,
+      left: _position.dx,
+      top: _position.dy,
+      child: _buildContent(screenSize),
+    );
+  }
+
+  Widget _buildContent(Size screenSize) {
+    return GestureDetector(
+      onPanStart: (details) {
+        setState(() {
+          _isDragging = true;
+        });
+      },
+      onPanUpdate: (details) {
+        setState(() {
+          _position += details.delta;
+          _position = Offset(
+            _position.dx.clamp(0.0, screenSize.width - 100.w),
+            _position.dy.clamp(0.0, screenSize.height - 100.w),
+          );
+        });
+      },
+      onPanEnd: (details) {
+        _snapToEdge(screenSize.width);
+      },
+      child: Obx(() {
+        final callSession = _callManager.currentCall.value;
+        final isConnected = callSession != null && _callManager.callDurationSeconds.value > 0;
+        final callDuration = _callManager.callDurationSeconds.value;
+
+        return Container(
+          width: 100.w,
+          height: 100.w,
+          decoration: BoxDecoration(
+            borderRadius: BorderRadius.circular(8.w),
+            boxShadow: [
+              BoxShadow(
+                color: Colors.black.withOpacity(0.3),
+                blurRadius: 8,
+                offset: const Offset(0, 2),
+              ),
+            ],
+          ),
+          child: ClipRRect(
+            borderRadius: BorderRadius.circular(8.w),
+            child: Stack(
+              children: [
+                // 背景：头像
+                Container(
+                  width: 100.w,
+                  height: 100.w,
+                  color: Colors.black,
+                  child: widget.targetAvatarUrl != null && widget.targetAvatarUrl!.isNotEmpty
+                      ? CachedNetworkImage(
+                          imageUrl: widget.targetAvatarUrl!,
+                          fit: BoxFit.cover,
+                          errorWidget: (context, url, error) => Image.asset(
+                            Assets.imagesUserAvatar,
+                            fit: BoxFit.cover,
+                          ),
+                        )
+                      : Image.asset(
+                          Assets.imagesUserAvatar,
+                          fit: BoxFit.cover,
+                        ),
+                ),
+                // 半透明遮罩
+                Container(
+                  color: Colors.black.withOpacity(0.4),
+                ),
+                // 内容：昵称和状态
+                Positioned(
+                  bottom: 8.w,
+                  left: 4.w,
+                  right: 4.w,
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      // 昵称
+                      Text(
+                        widget.targetUserName ?? widget.targetUserId,
+                        style: TextStyle(
+                          color: Colors.white,
+                          fontSize: 10.sp,
+                          fontWeight: FontWeight.w600,
+                        ),
+                        maxLines: 1,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                      SizedBox(height: 2.h),
+                      // 通话状态
+                      Text(
+                        isConnected ? _formatDuration(callDuration) : '通话中',
+                        style: TextStyle(
+                          color: Colors.white.withOpacity(0.9),
+                          fontSize: 8.sp,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ).onTap(() {
+          // 点击小窗，返回视频通话页面
+          Get.to(() => VideoCallPage(
+            targetUserId: widget.targetUserId,
+            isInitiator: callSession?.isInitiator ?? true,
+          ));
+          widget.onClose?.call();
+        });
+      }),
+    );
+  }
+}
+