fix(security): close auth & site-scoping gaps across 8 findings

Resolves the auth-theme batch from the 2026-05-28 baseline review (8 findings
across Security/CentralUI/ManagementService/CLI). The most consequential gaps:
NotificationReport + SiteCallsReport now route through SiteScopeService so a
site-scoped Deployment user cannot see or act on other sites' rows (CUI-028);
QueryAuditLogCommand is no longer "any authenticated user" — gated Admin-only
to match /api/audit/query's strictness (MS-018); RoleMapper preserves the
broader grant when a user is in both an unscoped and scoped Deployment LDAP
group, instead of silently narrowing to the scoped set (Sec-016); and the
dead SiteScopeRequirement/Handler are deleted so SiteScopeService is
unambiguously the sole site-scoping mechanism (Sec-017). Pending findings:
172 → 164.

tests/ScadaLink.CentralUI.Tests/Pages/NotificationReportDetailModalTests.cs

@@ -93,6 +93,7 @@ public class NotificationReportDetailModalTests : BunitContext
         var user = new ClaimsPrincipal(new ClaimsIdentity(claims, "TestAuth"));
         Services.AddSingleton<AuthenticationStateProvider>(new TestAuthStateProvider(user));
         Services.AddAuthorizationCore();
+        Services.AddScoped<ScadaLink.CentralUI.Auth.SiteScopeService>();
     }
 
     [Fact]