fix(input): use nanoseconds for device sensor intervals

[qiin2333]

改了啥呀

• 把设备陀螺仪和加速度计订阅的 interval 按纳秒计算
• 保留 200 Hz 上限，对应 Sensor Service Kit 支持的 5 ms 最小间隔
• 日志字段同步改成 ns，省得以后又被这个杂鱼单位骗到啦

为啥要改

HarmonyOS Sensor Service Kit 的数值型 interval 单位是纳秒；原实现却按微秒计算。比如请求 100 Hz 时，原来传入的是 10,000 ns，而正确值应为 10,000,000 ns，差了 1000 倍。

官方示例也以 100,000,000 ns 表示 100 ms，并说明常见支持范围为 5,000,000–200,000,000 ns：
https://gitee.com/openharmony/docs/blob/30904d2051d468bd681b08da17cbc6e87a77dbf1/en/application-dev/device/sensor-guidelines.md

本 PR 不改运动数据协议单位：陀螺仪仍从 rad/s 转成 deg/s，加速度计仍以 m/s² 发送。也不偷偷加死区或自动校准，免得把真实的慢速动作一起吃掉，哼。

验证

• npm run check
• node hvigorw.js assembleApp --mode project -p product=default -p buildMode=debug --no-daemon --stacktrace（unsigned，BUILD SUCCESSFUL）

Summary by CodeRabbit

• 改进
  • 优化陀螺仪和加速度计的传感器采样间隔计算，提升高频采样场景下的计时精度。
  • 统一使用纳秒（ns）作为采样间隔单位，并同步更新相关状态日志。
  • 保持传感器数据转换、去重、方向校正及事件分发行为不变。

[coderabbitai]

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📥 Commits

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• entry/src/main/ets/service/input/DeviceSensorService.ets

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📝 Walkthrough

Walkthrough

DeviceSensorService 将陀螺仪和加速度计的采样间隔单位从微秒改为纳秒。间隔计算继续限制为最高 200 Hz。订阅参数和启用日志同步使用纳秒单位。

Changes

传感器采样间隔更新

Layer / File(s)	Summary
纳秒间隔计算 entry/src/main/ets/service/input/DeviceSensorService.ets	新增纳秒换算常量和 200 Hz 上限。陀螺仪与加速度计按纳秒计算采样间隔。
传感器订阅应用 entry/src/main/ets/service/input/DeviceSensorService.ets	陀螺仪与加速度计的 sensor.on 使用纳秒间隔。启用日志将单位从 us 改为 ns。

Estimated code review effort: 1 (简单) | ~5 分钟

Merge Risk: ⚪ Minimal · up to a754e

This localized change updates sensor interval calculations and related logging; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了将设备传感器采样间隔改为纳秒的主要变更，内容清晰且具体。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-sensor-report-interval

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