fix(stats): use rolling host latency for live overlay

[qiin2333]

改了啥喵

• 增加最近 1 秒主机处理延迟窗口统计。
• 性能浮层的 hostLatency 改为实时窗口平均值。
• 保留累计主机延迟总量和帧数，串流结束报告继续使用全局平均值。

为啥要改

之前客户端把整个会话的累计平均主机延迟直接显示在实时浮层里。一次网络或编码抖动留下的高延迟样本会一直拖住后续数值，看起来就像主机延迟持续上升，杂鱼统计把历史包袱背太久了。

验证

• npm run test:sunshine-mock
• git diff --check
• HarmonyOS assembleHap 未执行成功：本机缺少 DevEco/Hvigor，脚本尝试从 npm 获取不存在的 hvigor 包。

关联 issue：#57

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📥 Commits

Reviewing files that changed from the base of the PR and between e1a6c99 and d2e3e31.

📒 Files selected for processing (4)

• entry/src/main/ets/service/streaming/StreamingSession.ets
• nativelib/src/main/cpp/moonlight_bridge.cpp
• nativelib/src/main/cpp/video_decoder.cpp
• nativelib/src/main/cpp/video_decoder.h

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-live-host-latency-stats

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