feat: 给 asynctaskext/busext 增加 Prometheus 处理耗时+QPS 埋点 - #736
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新增 observability 包里的两个 Histogram 单例 asynctask_task_duration_seconds / bus_task_duration_seconds， config <NS>monitor_enable 开关可选开启，默认关闭零开销； 不自建 /metrics HTTP server，照搬 cachext 的既有惯例。 指标名/label(task_name/queue/status)/buckets 与 Python coast 库 （coast/celery.py）完全一致，可跨语言合并查询。asynctaskext 因 machinery 全局 hook 拿不到单次调用的成功/失败，status 固定 "unknown"；busext 的 dispatch() 能拿到真实错误分支，status 为 success/failure/parse_error/invalid_message 之一。 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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新增 observability 包里的两个 Histogram 单例
asynctask_task_duration_seconds / bus_task_duration_seconds， config monitor_enable 开关可选开启，默认关闭零开销；
不自建 /metrics HTTP server，照搬 cachext 的既有惯例。
指标名/label(task_name/queue/status)/buckets 与 Python coast 库 （coast/celery.py）完全一致，可跨语言合并查询。asynctaskext 因
machinery 全局 hook 拿不到单次调用的成功/失败，status 固定
"unknown"；busext 的 dispatch() 能拿到真实错误分支，status 为
success/failure/parse_error/invalid_message 之一。