feat(sitecallaudit): query, KPI and detail backend for the Site Calls page

src/ScadaLink.SiteCallAudit/ServiceCollectionExtensions.cs

@@ -7,33 +7,34 @@ namespace ScadaLink.SiteCallAudit;
 /// </summary>
 /// <remarks>
 /// <para>
-/// M3 Bundle C ships the ingest-only minimum surface (the actor itself); the
-/// full DI surface — reconciliation puller, KPI projector, central→site
-/// Retry/Discard relay, options + validators — is deferred to a follow-up.
+/// Binds <see cref="SiteCallAuditOptions"/> (stuck-call detection + KPI
+/// windowing for the read-side query/KPI handlers). The reconciliation puller
+/// and central→site Retry/Discard relay are still deferred to later follow-ups.
 /// </para>
 /// <para>
 /// The repository (<c>ISiteCallAuditRepository</c>) is registered by
 /// <c>ScadaLink.ConfigurationDatabase.ServiceCollectionExtensions.AddConfigurationDatabase</c>,
 /// so callers (the Host on the central node) must also call that. The actor's
-/// <c>Props</c> are wired up in Host registration (Bundle F); this extension
-/// is currently a no-op placeholder kept for symmetry with the AuditLog and
-/// NotificationOutbox composition roots — adding it now means consumers can
-/// reference the method without re-touching the Host project later.
+/// <c>Props</c> are wired up in Host registration.
 /// </para>
 /// </remarks>
 public static class ServiceCollectionExtensions
 {
+    /// <summary>Configuration section bound to <see cref="SiteCallAuditOptions"/>.</summary>
+    public const string OptionsSection = "ScadaLink:SiteCallAudit";
+
     /// <summary>
-    /// Registers Site Call Audit (#22) services. Currently a no-op
-    /// placeholder — Bundle F will populate this with the actor's Props
-    /// factory + options bindings. The method is exposed now so the Host
-    /// wiring call already exists at the API boundary.
+    /// Registers Site Call Audit (#22) services: the <see cref="SiteCallAuditOptions"/>
+    /// binding consumed by the actor's read-side KPI/query handlers. The actor's
+    /// <c>Props</c> are still constructed inline in Host wiring.
     /// </summary>
     public static IServiceCollection AddSiteCallAudit(this IServiceCollection services)
     {
         ArgumentNullException.ThrowIfNull(services);
-        // Actor props are constructed in Host wiring (Bundle F). This
-        // extension is a placeholder for future config + DI.
+
+        services.AddOptions<SiteCallAuditOptions>()
+            .BindConfiguration(OptionsSection);
+
         return services;
     }
 }