feat: wire SQLite replication between site nodes and fix ConfigurationDatabase tests

Add SiteReplicationActor (runs on every site node) to replicate deployed
configs and store-and-forward buffer operations to the standby peer via
cluster member discovery and fire-and-forget Tell. Wire ReplicationService
handler and pass replication actor to DeploymentManagerActor singleton.

Fix 5 pre-existing ConfigurationDatabase test failures: RowVersion NOT NULL
on SQLite, stale migration name assertion, and seed data count mismatch.

src/ScadaLink.CentralUI/Components/Pages/Deployment/DebugView.razor

@@ -11,15 +11,11 @@
 @inject ITemplateEngineRepository TemplateEngineRepository
 @inject ISiteRepository SiteRepository
 @inject CommunicationService CommunicationService
+@inject IJSRuntime JS
 @implements IDisposable
 
 <div class="container-fluid mt-3">
-    <div class="d-flex justify-content-between align-items-center mb-3">
-        <h4 class="mb-0">Debug View</h4>
-        <div class="alert alert-info py-1 px-2 mb-0 small">
-            Debug view streams are lost on failover. Re-open if connection drops.
-        </div>
-    </div>
+    <h4 class="mb-3">Debug View</h4>
 
     <ToastNotification @ref="_toast" />
 
@@ -182,6 +178,24 @@
         _loading = false;
     }
 
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (!firstRender) return;
+
+        var storedSiteId = await JS.InvokeAsync<string>("localStorage.getItem", "debugView.siteId");
+        var storedInstanceName = await JS.InvokeAsync<string>("localStorage.getItem", "debugView.instanceName");
+
+        if (!string.IsNullOrEmpty(storedSiteId) && int.TryParse(storedSiteId, out var siteId)
+            && !string.IsNullOrEmpty(storedInstanceName))
+        {
+            _selectedSiteId = siteId;
+            await LoadInstancesForSite();
+            _selectedInstanceName = storedInstanceName;
+            StateHasChanged();
+            await Connect();
+        }
+    }
+
     private async Task LoadInstancesForSite()
     {
         _siteInstances.Clear();
@@ -224,6 +238,12 @@
             }
 
             _connected = true;
+
+            // Persist selection to localStorage for auto-reconnect on refresh
+            await JS.InvokeVoidAsync("localStorage.setItem", "debugView.siteId", _selectedSiteId.ToString());
+            await JS.InvokeVoidAsync("localStorage.setItem", "debugView.instanceName", _selectedInstanceName);
+            await JS.InvokeVoidAsync("localStorage.setItem", "debugView.siteIdentifier", site.SiteIdentifier);
+
             _toast.ShowSuccess($"Connected to {_selectedInstanceName}");
 
             // Periodic refresh (simulating SignalR push by re-subscribing)
@@ -253,7 +273,7 @@
         _connecting = false;
     }
 
-    private void Disconnect()
+    private async Task Disconnect()
     {
         _refreshTimer?.Dispose();
         _refreshTimer = null;
@@ -268,6 +288,11 @@
             }
         }
 
+        // Clear persisted selection — user explicitly disconnected
+        await JS.InvokeVoidAsync("localStorage.removeItem", "debugView.siteId");
+        await JS.InvokeVoidAsync("localStorage.removeItem", "debugView.instanceName");
+        await JS.InvokeVoidAsync("localStorage.removeItem", "debugView.siteIdentifier");
+
         _connected = false;
         _snapshot = null;
         _attributeValues.Clear();