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.

src/ScadaLink.CLI/Commands/CommandHelpers.cs

@@ -164,7 +164,7 @@ internal static class CommandHelpers
     /// both channels are honoured. (Authentication failure — HTTP 401 / bad credentials
     /// — is deliberately <em>not</em> treated as authorization failure; it is exit 1.)
     /// </summary>
-    private static bool IsAuthorizationFailure(ManagementResponse response)
+    internal static bool IsAuthorizationFailure(ManagementResponse response)
     {
         if (response.StatusCode == 403)
             return true;