measurement: name the kinds by protocol and action, add the http_request kind and QUIC settings

backend/shared/MoShiro.Measurement/Core/AdaptiveRate.cs

@@ -65,6 +65,9 @@ public sealed record AdaptiveRateOptions
 
     public double RttFloorMs { get; init; } = 5;
 
+    /// <summary>用 RTT p99 的置信区间限制降频。样本稀少的任务（每分钟几次）估不出区间，关掉后平稳频率只由丢包上界决定。</summary>
+    public bool RttGuard { get; init; } = true;
+
     /// <summary>先验：时间 → 这个时刻丢包的历史概率（0 到 1）；null 表示没有历史。</summary>
     public Func<long, double?>? Prior { get; init; }
 
@@ -285,7 +288,7 @@ public sealed class AdaptiveRate
             UpdateGuard(nowUs);
             double hz = next switch
             {
-                ProbeState.Quiet => Quantize(Math.Max(QuietHz(QuietWindowSeconds(nowUs)), double.IsNaN(_guardHz) ? _options.MaxHz : _guardHz)),
+                ProbeState.Quiet => Quantize(Math.Max(QuietHz(QuietWindowSeconds(nowUs)), !_options.RttGuard ? _options.MinHz : double.IsNaN(_guardHz) ? _options.MaxHz : _guardHz)),
                 ProbeState.Watch or ProbeState.Active => _options.MaxHz,
                 _ => Math.Max(_options.MinHz / 4, 1.0 / _options.DeadMaxIntervalSeconds),
             };