refactor: rename ScadaLink → ZB.MOM.WW.ScadaBridge (code + projects + namespaces)

Solution + 23 src projects + 26 test projects renamed; folders, csproj,
namespaces, and ScadaLinkDbContext/ScadaBridgeDbContext class updated.
ActorSystem "scadalink" → "scadabridge", Akka seed-node URLs migrated.
SQL roles/logins, LDAP domains, CLI command name, and CLI config dir
(~/.scadalink → ~/.scadabridge) also renamed.

Build green; 5 Host.Tests fail awaiting SQL login rename in next commit.
Pre-existing StaleTagMonitor timing flakes unchanged.

Rename script committed at tools/rename-to-scadabridge.sh.

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/LoadingSpinner.razor

@@ -0,0 +1,17 @@
+@* Reusable loading spinner *@
+
+@if (IsLoading)
+{
+    <div class="d-flex align-items-center text-secondary @CssClass">
+        <div class="spinner-border spinner-border-sm me-2" role="status">
+            <span class="visually-hidden">Loading...</span>
+        </div>
+        <span>@Message</span>
+    </div>
+}
+
+@code {
+    [Parameter] public bool IsLoading { get; set; }
+    [Parameter] public string Message { get; set; } = "Loading...";
+    [Parameter] public string CssClass { get; set; } = "";
+}