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.Historian.Wonderware.Client/Internal/QualityMapper.cs

@@ -0,0 +1,39 @@
+namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client.Internal;
+
+/// <summary>
+///     Maps a raw OPC DA quality byte (as returned by Wonderware Historian's <c>OpcQuality</c>)
+///     to an OPC UA <c>StatusCode</c> uint. Byte-identical port of the sidecar's
+///     <c>HistorianQualityMapper.Map</c> — kept in sync via parity tests rather than a
+///     shared assembly because the sidecar is .NET 4.8 x86 and the client is .NET 10 x64.
+/// </summary>
+internal static class QualityMapper
+{
+    public static uint Map(byte q) => q switch
+    {
+        // Good family (192+)
+        192 => 0x00000000u,             // Good
+        216 => 0x00D80000u,             // Good_LocalOverride
+
+        // Uncertain family (64-191)
+        64  => 0x40000000u,             // Uncertain
+        68  => 0x40900000u,             // Uncertain_LastUsableValue
+        80  => 0x40930000u,             // Uncertain_SensorNotAccurate
+        84  => 0x40940000u,             // Uncertain_EngineeringUnitsExceeded
+        88  => 0x40950000u,             // Uncertain_SubNormal
+
+        // Bad family (0-63)
+        0   => 0x80000000u,             // Bad
+        4   => 0x80890000u,             // Bad_ConfigurationError
+        8   => 0x808A0000u,             // Bad_NotConnected
+        12  => 0x808B0000u,             // Bad_DeviceFailure
+        16  => 0x808C0000u,             // Bad_SensorFailure
+        20  => 0x80050000u,             // Bad_CommunicationError
+        24  => 0x808D0000u,             // Bad_OutOfService
+        32  => 0x80320000u,             // Bad_WaitingForInitialData
+
+        // Unknown — fall back to category bucket so callers still get something usable.
+        _ when q >= 192 => 0x00000000u,
+        _ when q >= 64  => 0x40000000u,
+        _               => 0x80000000u,
+    };
+}