refactor(stream): add asio session coordinator

[qiin2333]

依赖

• feat(stream): expose active session telemetry #801 已经合入 master
• 当前堆叠为：master ← fix(nvhttp): scope cancel to authenticated client #802 ← 本 PR
• 本分支已重放到更新后的 fix(nvhttp): scope cancel to authenticated client #802，不再携带 feat(stream): expose active session telemetry #801 的旧提交

改了啥呀

• 新增基于 Boost.Asio strand 的活动会话协调器，所有生命周期观测在单写执行域内更新
• 使用单调状态 starting → active → draining → closed，迟到事件不能让最近关闭的会话复活
• 固化已认证证书 UUID 所有权；同一会话 ID 尝试切换到其他非空 UUID 时拒绝并计数
• 保留最多 256 个关闭墓碑，防止迟到回调复活，同时限制内存增长
• RTSP 的创建、启动成功、客户端取消、自然停止、启动失败和关闭路径发送协调器事件
• /sessions 增加 lifecycle_state、协调器版本和拒绝事件计数，方便对照现有真实会话状态

迁移边界

这层仍是影子协调器：它不拥有 socket、编码器或音视频线程，也不改变现有 timeout、join()、应用终止和显示恢复时序。事件投递失败会被隔离，不能反向影响串流生命周期。控制面事件经过 strand；编码、采集、加密和媒体发包仍保持原来的并行数据面。

验证

• git diff --check
• range-diff 确认旧的 fix(nvhttp): scope cancel to authenticated client #802 lifecycle 修补已归入基线，coordinator 独有逻辑保持不变
• 使用现有 Windows -Werror 编译参数检查 stream.cpp、sessions.cpp、rtsp.cpp、session_coordinator.cpp 和协调器测试
• 完整 Windows 构建与原生测试重新交给本分支 CI

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