fix(historian): #691 review — clamp Gateway at-or-after read, GoodNoData when nothing exists, HonorReturnBounds kill switch

1. The at-or-after bound read on a forward-only backend (Gateway) ends at
   now + ReverseRawReader.LookAhead instead of DateTime.MaxValue (the gateway
   only checks start <= end, so a year-9999 end reached AVEVA); a bound beyond
   the horizon is not found without a read. SqlServer/QuestDB keep MaxValue:
   they bind it safely and may hold samples further ahead. The Gateway fake now
   refuses far-future ends, so the missing-end-bound test is no longer vacuous.
3. No data and no bound found (whole read empty) => GoodNoData, no values —
   the pre-bounds answer (6.5.3.2: success only if one or both bounds exist).
   A one-value page whose start bound is missing first checks there is data or
   a found end bound.
4. ServerHistorian:HonorReturnBounds (default true); false ignores ReturnBounds
   as before #691, including the modified-read Bad_InvalidArgument.

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs

@@ -89,6 +89,14 @@ public sealed class ServerHistorianOptions
     /// </summary>
     public int MaxTieClusterOverfetch { get; init; } = 65536;
 
+    /// <summary>
+    ///     Gitea #691: whether HistoryRead-Raw honours <c>ReadRawModifiedDetails.ReturnBounds</c> (OPC UA Part 11 bounding
+    ///     values). Default <c>true</c>. <c>false</c> is the kill switch back to the pre-#691 answer: the flag is ignored
+    ///     (stored samples only) and a modified read carrying it is not refused <c>Bad_InvalidArgument</c>. Note the .NET
+    ///     SDK's <c>new ReadRawModifiedDetails()</c> defaults <c>ReturnBounds</c> (and <c>IsReadModified</c>) to <c>true</c>.
+    /// </summary>
+    public bool HonorReturnBounds { get; init; } = true;
+
     /// <summary>
     ///     Maximum number of historized nodes served CONCURRENTLY within one HistoryRead batch (arch-review
     ///     03/S3). The SDK's <c>HistoryRead*</c> override surface is synchronous, so each arm block-bridges