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/Server/ZB.MOM.WW.OtOpcUa.Admin/Security/RoleMapper.cs

@@ -0,0 +1,23 @@
+namespace ZB.MOM.WW.OtOpcUa.Admin.Security;
+
+/// <summary>
+///     Deterministic LDAP-group-to-Admin-role mapper driven by <see cref="LdapOptions.GroupToRole"/>.
+///     Every returned role corresponds to a group the user actually holds; no inference.
+/// </summary>
+public static class RoleMapper
+{
+    public static IReadOnlyList<string> Map(
+        IReadOnlyCollection<string> ldapGroups,
+        IReadOnlyDictionary<string, string> groupToRole)
+    {
+        if (groupToRole.Count == 0) return [];
+
+        var roles = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+        foreach (var group in ldapGroups)
+        {
+            if (groupToRole.TryGetValue(group, out var role))
+                roles.Add(role);
+        }
+        return [.. roles];
+    }
+}