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>

tests/Server/ZB.MOM.WW.OtOpcUa.Admin.Tests/RoleMapperTests.cs

@@ -0,0 +1,61 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Admin.Security;
+
+namespace ZB.MOM.WW.OtOpcUa.Admin.Tests;
+
+[Trait("Category", "Unit")]
+public sealed class RoleMapperTests
+{
+    [Fact]
+    public void Maps_single_group_to_single_role()
+    {
+        var mapping = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["ReadOnly"] = "ConfigViewer",
+        };
+        RoleMapper.Map(["ReadOnly"], mapping).ShouldBe(["ConfigViewer"]);
+    }
+
+    [Fact]
+    public void Group_match_is_case_insensitive()
+    {
+        var mapping = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["ReadOnly"] = "ConfigViewer",
+        };
+        RoleMapper.Map(["readonly"], mapping).ShouldContain("ConfigViewer");
+    }
+
+    [Fact]
+    public void User_with_multiple_matching_groups_gets_all_distinct_roles()
+    {
+        var mapping = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["ReadOnly"] = "ConfigViewer",
+            ["ReadWrite"] = "ConfigEditor",
+            ["AlarmAck"] = "FleetAdmin",
+        };
+        var roles = RoleMapper.Map(["ReadOnly", "ReadWrite", "AlarmAck"], mapping);
+        roles.ShouldContain("ConfigViewer");
+        roles.ShouldContain("ConfigEditor");
+        roles.ShouldContain("FleetAdmin");
+        roles.Count.ShouldBe(3);
+    }
+
+    [Fact]
+    public void Unknown_group_is_ignored()
+    {
+        var mapping = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["ReadOnly"] = "ConfigViewer",
+        };
+        RoleMapper.Map(["UnrelatedGroup"], mapping).ShouldBeEmpty();
+    }
+
+    [Fact]
+    public void Empty_mapping_returns_empty_roles()
+    {
+        RoleMapper.Map(["ReadOnly"], new Dictionary<string, string>()).ShouldBeEmpty();
+    }
+}