rename: prefix gateway projects/namespaces with ZB.MOM.WW + sln→slnx

Apply the ZB.MOM.WW. prefix to all gateway-side projects, folders,
.csproj/.sln contents, C# namespaces, using directives, generated proto
C# (csharp_namespace + checked-in generated files), InternalsVisibleTo
attributes, project-name string literals (LoadProject, .sln lookups,
worker exe paths, staticwebassets manifest), and the install/script/doc
references that point at any of the above. Migrate the solution from
.sln to .slnx via `dotnet sln migrate` and delete the old file.

External-runtime identifiers are intentionally NOT prefixed so external
configuration keeps working:
- GatewayMetrics.cs MeterName ("MxGateway.Server")
- DashboardAuthenticationDefaults Scheme/Policy ("MxGateway.Dashboard")
- GatewayRequestLoggingMiddleware logger category ("MxGateway.Request")
- StaRuntime thread name ("MxGateway.Worker.STA")
- appsettings.json root section "MxGateway" + env-var prefix
  MxGateway__... and secret-name MxGateway:ApiKeyPepper
- C:\ProgramData\MxGateway\ data dir paths

Also fixes two tests that were not rename-related but became visible
while validating the rename:

- WorkerLiveMxAccessSmokeTests.ShutDownAsync: cancellation that the
  gateway service correctly maps to RpcException(Cancelled) per gRPC
  convention was being misclassified as a stream fault. Added a sibling
  catch on RpcException with StatusCode.Cancelled.

- IntegrationTestEnvironment.ResolveRepositoryRoot: extracted IsRepositoryRoot
  and made it accept either a .git marker OR a .sln/.slnx next to src/
  so the worker-exe walker works in non-git working copies.

clients/proto/proto-inputs.json's protoRoot updated to point at
src/ZB.MOM.WW.MxGateway.Contracts/Protos.

Verified by `dotnet build` and a full `dotnet test` of the .slnx with
MXGATEWAY_RUN_LIVE_{MXACCESS,LDAP,GALAXY}_TESTS=1:
  Tests: 472/472 pass
  Worker.Tests: 280/280 pass (4 dev-rig [Fact(Skip=...)] skipped)
  IntegrationTests: 18/18 pass

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ZB.MOM.WW.MxGateway.Server/Dashboard/Components/Pages/DashboardHome.razor

@@ -0,0 +1,78 @@
+@page "/"
+@page "/dashboard/"
+@inherits DashboardPageBase
+
+<PageTitle>MXAccess Gateway Dashboard</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading dashboard snapshot.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Overview</h1>
+            <div class="text-secondary">Generated @DashboardDisplay.DateTime(Snapshot.GeneratedAt)</div>
+        </div>
+        <StatusBadge Text="@Snapshot.GatewayStatus" />
+    </div>
+
+    <section class="metric-grid">
+        <MetricCard Label="Uptime" Value="@DashboardDisplay.Duration(Snapshot.GatewayUptime)" Detail="@Snapshot.GatewayVersion" />
+        <MetricCard Label="Open Sessions" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.sessions.open"))" />
+        <MetricCard Label="Workers Running" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.workers.running"))" />
+        <MetricCard Label="Event Queue Depth" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.worker_queue.depth"))" />
+        <MetricCard Label="Commands Failed" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.commands.failed"))" />
+        <MetricCard Label="Events Received" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.received"))" />
+        <MetricCard Label="Faults" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.faults"))" />
+        <MetricCard Label="Queue Overflows" Value="@DashboardDisplay.Count(DashboardDisplay.MetricValue(Snapshot, "mxgateway.queues.overflows"))" />
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading d-flex align-items-center gap-2">
+            <h2>Galaxy Repository</h2>
+            <StatusBadge Text="@Snapshot.Galaxy.Status.ToString()" />
+            <NavLink class="ms-auto small" href="galaxy">View browse details &rarr;</NavLink>
+        </div>
+        <div class="metric-grid compact">
+            <MetricCard Label="Last Deploy" Value="@DashboardDisplay.DateTime(Snapshot.Galaxy.LastDeployTime)" />
+            <MetricCard Label="Objects" Value="@DashboardDisplay.Count(Snapshot.Galaxy.ObjectCount)" Detail="@($"{Snapshot.Galaxy.AreaCount:N0} areas")" />
+            <MetricCard Label="Attributes" Value="@DashboardDisplay.Count(Snapshot.Galaxy.AttributeCount)" />
+            <MetricCard Label="Historized" Value="@DashboardDisplay.Count(Snapshot.Galaxy.HistorizedAttributeCount)" />
+            <MetricCard Label="Alarms" Value="@DashboardDisplay.Count(Snapshot.Galaxy.AlarmAttributeCount)" />
+            <MetricCard Label="Last Refresh" Value="@DashboardDisplay.DateTime(Snapshot.Galaxy.LastSuccessAt)" Detail="@GalaxyRefreshDetail()" />
+        </div>
+        @if (!string.IsNullOrWhiteSpace(Snapshot.Galaxy.LastError))
+        {
+            <div class="empty-state mt-2">@Snapshot.Galaxy.LastError</div>
+        }
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Recent Faults</h2>
+        </div>
+        <FaultList Faults="@Snapshot.Faults" />
+    </section>
+}
+
+@code {
+    private string? GalaxyRefreshDetail()
+    {
+        DashboardGalaxySummary galaxy = Snapshot!.Galaxy;
+        if (galaxy.LastQueriedAt is null)
+        {
+            return "never queried";
+        }
+
+        if (galaxy.LastSuccessAt is null)
+        {
+            return "no successful refresh yet";
+        }
+
+        return galaxy.LastQueriedAt > galaxy.LastSuccessAt
+            ? $"last attempt {DashboardDisplay.DateTime(galaxy.LastQueriedAt)}"
+            : null;
+    }
+}