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/Tooling/ZB.MOM.WW.OtOpcUa.Analyzers/ZB.MOM.WW.OtOpcUa.Analyzers.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <!-- Roslyn analyzers ship as netstandard2.0 so they load into the MSBuild compiler host
+             (which on .NET Framework 4.7.2 and .NET 6+ equally resolves netstandard2.0). -->
+        <TargetFramework>netstandard2.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <LangVersion>latest</LangVersion>
+        <IsPackable>false</IsPackable>
+        <IsRoslynComponent>true</IsRoslynComponent>
+        <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+        <RootNamespace>ZB.MOM.WW.OtOpcUa.Analyzers</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.3.0" PrivateAssets="all"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <AdditionalFiles Include="AnalyzerReleases.Shipped.md"/>
+        <AdditionalFiles Include="AnalyzerReleases.Unshipped.md"/>
+    </ItemGroup>
+
+</Project>