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/Components/Pages/Home.razor

@@ -0,0 +1,72 @@
+@page "/"
+@using ZB.MOM.WW.OtOpcUa.Admin.Services
+@using ZB.MOM.WW.OtOpcUa.Configuration.Entities
+@inject ClusterService ClusterSvc
+@inject GenerationService GenerationSvc
+@inject NavigationManager Nav
+
+<h1 class="mb-4">Fleet overview</h1>
+
+@if (_clusters is null)
+{
+    <p>Loading…</p>
+}
+else if (_clusters.Count == 0)
+{
+    <div class="alert alert-info">
+        No clusters configured yet. <a href="/clusters/new">Create the first cluster</a>.
+    </div>
+}
+else
+{
+    <div class="row g-3 mb-4">
+        <div class="col-md-3">
+            <div class="card"><div class="card-body"><h6 class="text-muted">Clusters</h6><div class="fs-2">@_clusters.Count</div></div></div>
+        </div>
+        <div class="col-md-3">
+            <div class="card"><div class="card-body"><h6 class="text-muted">Active drafts</h6><div class="fs-2">@_activeDraftCount</div></div></div>
+        </div>
+        <div class="col-md-3">
+            <div class="card"><div class="card-body"><h6 class="text-muted">Published generations</h6><div class="fs-2">@_publishedCount</div></div></div>
+        </div>
+        <div class="col-md-3">
+            <div class="card"><div class="card-body"><h6 class="text-muted">Disabled clusters</h6><div class="fs-2">@_clusters.Count(c => !c.Enabled)</div></div></div>
+        </div>
+    </div>
+
+    <h4 class="mt-4 mb-3">Clusters</h4>
+    <table class="table table-hover">
+        <thead><tr><th>ClusterId</th><th>Name</th><th>Enterprise / Site</th><th>Redundancy</th><th>Enabled</th><th></th></tr></thead>
+        <tbody>
+        @foreach (var c in _clusters)
+        {
+            <tr style="cursor: pointer;">
+                <td><code>@c.ClusterId</code></td>
+                <td>@c.Name</td>
+                <td>@c.Enterprise / @c.Site</td>
+                <td>@c.RedundancyMode</td>
+                <td>@(c.Enabled ? "Yes" : "No")</td>
+                <td><a href="/clusters/@c.ClusterId" class="btn btn-sm btn-outline-primary">Open</a></td>
+            </tr>
+        }
+        </tbody>
+    </table>
+}
+
+@code {
+    private List<ServerCluster>? _clusters;
+    private int _activeDraftCount;
+    private int _publishedCount;
+
+    protected override async Task OnInitializedAsync()
+    {
+        _clusters = await ClusterSvc.ListAsync(CancellationToken.None);
+
+        foreach (var c in _clusters)
+        {
+            var gens = await GenerationSvc.ListRecentAsync(c.ClusterId, 50, CancellationToken.None);
+            _activeDraftCount += gens.Count(g => g.Status.ToString() == "Draft");
+            _publishedCount += gens.Count(g => g.Status.ToString() == "Published");
+        }
+    }
+}