fix(client): offer exactly the served aggregates in the CLI and UI

R08 2.3: AggregateType drops StandardDeviation (no backend serves it; always
BadAggregateNotSupported) and gains Range, Delta, MinimumActualTime,
MaximumActualTime, PercentGood and PercentBad. A parity test pins the enum to
AggregateFamilies.Served and each member to its same-named Part 13 ObjectId.
The CLI parses every enum name (plus aliases) and the UI picker lists them all.
Existing members keep their numeric values; 6 is retired.

Refs #747
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

tests/Client/ZB.MOM.WW.OtOpcUa.Client.Shared.Tests/Models/ModelConstructionTests.cs

@@ -132,10 +132,10 @@ public class ModelConstructionTests
         ((int)ConnectionState.Reconnecting).ShouldBe(3);
     }
 
-    /// <summary>Verifies that AggregateType enum has the expected number of values.</summary>
+    /// <summary>AggregateType holds the seventeen served aggregates (the parity test pins which).</summary>
     [Fact]
     public void AggregateType_Enum_HasExpectedValues()
     {
-        Enum.GetValues<AggregateType>().Length.ShouldBe(12);
+        Enum.GetValues<AggregateType>().Length.ShouldBe(17);
     }
 }