chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy/Runtime/MxValueDecoder.cs

@@ -0,0 +1,54 @@
+using Google.Protobuf.WellKnownTypes;
+using MxGateway.Contracts.Proto;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Runtime;
+
+/// <summary>
+///     Translates gateway-side <see cref="MxValue"/> instances into the boxed CLR objects
+///     <c>DataValueSnapshot.Value</c> carries. Mirrors the seven Galaxy data types in
+///     <c>DataTypeMap</c> (Boolean, Int32, Int64, Float32, Float64, String, DateTime), plus
+///     the array variants exposed by <see cref="MxArray"/>. Unknown / awkward values fall
+///     back to the <c>raw_value</c> bytes so a forward-compatible MXAccess deployment
+///     doesn't lose data on the wire — the consumer can opt to deserialise the bytes.
+/// </summary>
+internal static class MxValueDecoder
+{
+    public static object? Decode(MxValue? value)
+    {
+        if (value is null) return null;
+        if (value.IsNull) return null;
+
+        return value.KindCase switch
+        {
+            MxValue.KindOneofCase.BoolValue       => value.BoolValue,
+            MxValue.KindOneofCase.Int32Value      => value.Int32Value,
+            MxValue.KindOneofCase.Int64Value      => value.Int64Value,
+            MxValue.KindOneofCase.FloatValue      => value.FloatValue,
+            MxValue.KindOneofCase.DoubleValue     => value.DoubleValue,
+            MxValue.KindOneofCase.StringValue     => value.StringValue,
+            MxValue.KindOneofCase.TimestampValue  => DecodeTimestamp(value.TimestampValue),
+            MxValue.KindOneofCase.ArrayValue      => DecodeArray(value.ArrayValue),
+            MxValue.KindOneofCase.RawValue        => value.RawValue.ToByteArray(),
+            _ => null,
+        };
+    }
+
+    private static DateTime? DecodeTimestamp(Timestamp? ts) => ts?.ToDateTime();
+
+    private static object? DecodeArray(MxArray? array)
+    {
+        if (array is null) return null;
+
+        return array.ValuesCase switch
+        {
+            MxArray.ValuesOneofCase.BoolValues       => array.BoolValues.Values.ToArray(),
+            MxArray.ValuesOneofCase.Int32Values      => array.Int32Values.Values.ToArray(),
+            MxArray.ValuesOneofCase.Int64Values      => array.Int64Values.Values.ToArray(),
+            MxArray.ValuesOneofCase.FloatValues      => array.FloatValues.Values.ToArray(),
+            MxArray.ValuesOneofCase.DoubleValues     => array.DoubleValues.Values.ToArray(),
+            MxArray.ValuesOneofCase.StringValues     => array.StringValues.Values.ToArray(),
+            MxArray.ValuesOneofCase.TimestampValues  => array.TimestampValues.Values.Select(t => t.ToDateTime()).ToArray(),
+            _ => null,
+        };
+    }
+}