feat(centralui): Create saves bindings (upsert) and lands on Configure with a created/bound/bindError notice

Claude-Session: https://claude.ai/code/session_01G2GHPnbbKGvyyfbr2XBRVH

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Deployment/InstanceConfigure.razor

@@ -81,6 +81,28 @@
             </div>
         </div>
 
+        @* One-shot notice for an instance that just arrived from the Create page
+           (design 2026-08-21). Query-string only — nothing is persisted, so it
+           disappears on any later visit. *@
+        @if (Created == 1)
+        {
+            <div class="alert @(BindError is null ? "alert-success" : "alert-warning") py-2 small" data-test="configure-created-notice">
+                Instance created.
+                @if (BindError is not null)
+                {
+                    <text>Bindings were NOT saved: @BindError — bind the groups below.</text>
+                }
+                else if (Bound is > 0)
+                {
+                    <text>@Bound binding(s) saved. Test Bindings, then Deploy.</text>
+                }
+                else
+                {
+                    <text>Bind the groups below, then Deploy.</text>
+                }
+            </div>
+        }
+
         @* Connection Bindings — grouped by module (design 2026-08-20). Rows come
            from the flattened configuration so composed module members appear;
            each group header carries a connection + Object apply that rewrites
@@ -710,6 +732,13 @@
 @code {
     [Parameter] public int Id { get; set; }
 
+    // Set by the Create Instance page's post-create redirect (design 2026-08-21):
+    // Created=1 always, then either the count of bindings saved or the error that
+    // stopped them being saved. Read-only display — never persisted.
+    [SupplyParameterFromQuery] public int? Created { get; set; }
+    [SupplyParameterFromQuery] public int? Bound { get; set; }
+    [SupplyParameterFromQuery] public string? BindError { get; set; }
+
     private Instance? _instance;
     private string _templateName = "";
     private string _siteName = "";