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.Shared/Adapters/DefaultSessionFactory.cs

@@ -0,0 +1,37 @@
+using Opc.Ua;
+using Opc.Ua.Client;
+using Serilog;
+
+namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Adapters;
+
+/// <summary>
+///     Production session factory that creates real OPC UA sessions.
+/// </summary>
+internal sealed class DefaultSessionFactory : ISessionFactory
+{
+    private static readonly ILogger Logger = Log.ForContext<DefaultSessionFactory>();
+
+    public async Task<ISessionAdapter> CreateSessionAsync(
+        ApplicationConfiguration config,
+        EndpointDescription endpoint,
+        string sessionName,
+        uint sessionTimeoutMs,
+        UserIdentity identity,
+        CancellationToken ct)
+    {
+        var endpointConfig = EndpointConfiguration.Create(config);
+        var configuredEndpoint = new ConfiguredEndpoint(null, endpoint, endpointConfig);
+
+        var session = await Session.Create(
+            config,
+            configuredEndpoint,
+            false,
+            sessionName,
+            sessionTimeoutMs,
+            identity,
+            null);
+
+        Logger.Information("Session created: {SessionName} -> {EndpointUrl}", sessionName, endpoint.EndpointUrl);
+        return new DefaultSessionAdapter(session);
+    }
+}