feat(focas): scale axis positions by 10^PositionDecimalPlaces (config-supplied)

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriverFactoryExtensions.cs

@@ -65,7 +65,8 @@ public static class FocasDriverFactoryExtensions
                     HostAddress: d.HostAddress ?? throw new InvalidOperationException(
                         $"FOCAS config for '{driverInstanceId}' has a device missing HostAddress"),
                     DeviceName: d.DeviceName,
-                    Series: ParseSeries(d.Series ?? dto.Series)))]
+                    Series: ParseSeries(d.Series ?? dto.Series),
+                    PositionDecimalPlaces: d.PositionDecimalPlaces ?? 0))]
                 : [],
             Tags = dto.Tags is { Count: > 0 }
                 ? [.. dto.Tags.Select(t => new FocasTagDefinition(
@@ -234,6 +235,13 @@ public static class FocasDriverFactoryExtensions
 
         /// <summary>Gets or sets the CNC series for this device (overrides top-level series if provided).</summary>
         public string? Series { get; init; }
+
+        /// <summary>
+        ///     Gets or sets the axis-position decimal places. <c>cnc_rddynamic2</c> returns
+        ///     positions as scaled integers; the driver divides by <c>10^PositionDecimalPlaces</c>
+        ///     so they surface in engineering units. Omitted / <c>0</c> = no scaling (legacy).
+        /// </summary>
+        public int? PositionDecimalPlaces { get; init; }
     }
 
     internal sealed class FocasTagDto