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/Client/ZB.MOM.WW.OtOpcUa.Client.CLI/Program.cs

@@ -0,0 +1,15 @@
+using CliFx;
+using ZB.MOM.WW.OtOpcUa.Client.CLI;
+
+return await new CliApplicationBuilder()
+    .AddCommandsFromThisAssembly()
+    .UseTypeActivator(type =>
+    {
+        // Inject the default factory into commands that derive from CommandBase
+        if (type.IsSubclassOf(typeof(CommandBase))) return Activator.CreateInstance(type, CommandBase.DefaultFactory)!;
+        return Activator.CreateInstance(type)!;
+    })
+    .SetExecutableName("otopcua-cli")
+    .SetDescription("OtOpcUa CLI - command-line client for the OtOpcUa OPC UA server")
+    .Build()
+    .RunAsync(args);