feat(ui): AuditLogPage parses query-string filters for drill-ins (#23 M7)

src/ScadaLink.CentralUI/Components/Audit/AuditFilterBar.razor.cs

@@ -32,8 +32,26 @@ public partial class AuditFilterBar
     /// </summary>
     [Parameter] public Func<DateTime>? NowUtcProvider { get; set; }
 
+    /// <summary>
+    /// Bundle D drill-in seam (#23 M7-T10..T12). When set on first render,
+    /// pre-populates the Instance free-text input. Instance is UI-only — the
+    /// repository filter contract has no instance column — so this flows in
+    /// through a separate parameter rather than the <see cref="AuditLogQueryFilter"/>
+    /// the parent page passes to the grid.
+    /// </summary>
+    [Parameter] public string? InitialInstanceSearch { get; set; }
+
     protected override async Task OnInitializedAsync()
     {
+        // One-shot prefill from a drill-in deep link. Subsequent parameter changes
+        // do NOT overwrite user input — the field is owned by the operator after
+        // first render.
+        if (!string.IsNullOrWhiteSpace(InitialInstanceSearch))
+        {
+            _model.InstanceSearch = InitialInstanceSearch.Trim();
+        }
+
+
         // Populate the Site chips at component init. Failure is non-fatal — the chip
         // section just shows "No sites available." Sites are listed by Name to match
         // operator expectations from the Notification Report.