fix(sms): code-review fixes — Admin-gate provider-config updates, guard secret-clear/data-loss, type-aware UI

Findings from the per-module code review of the SMS feature (code-reviews/):

- ManagementService (High): UpdateSmsConfig + UpdateSmtpConfig were Designer-gated
  while both /notifications/{sms,smtp} pages enforce RequireAdmin — a Designer
  blocked in the UI could still rotate a production credential via CLI. Moved both
  to the Administrator arm so the actor gate matches the UI.
- ManagementService (Medium): UpdateSmsConfig treated --auth-token "" as a value,
  silently clearing the stored Twilio token. Guard on IsNullOrWhiteSpace so empty ==
  omitted (SMTP Credentials keeps its null-only guard — empty is valid for no-auth).
- CentralUI (Medium): NotificationLists recipient badge rendered Name <Email>
  unconditionally, showing "Name <>" for SMS lists. Now type-aware (phone for SMS).
- ConfigurationDatabase (Medium): AddSmsNotifications.Down() backfilled NULL emails
  to '' — silent data loss for SMS-only recipients. Added a pre-drop guard that
  refuses rollback while such rows exist.
- NotificationOutbox (Low): SMS body truncation could split a surrogate pair at the
  cap boundary; back off one code unit to stay well-formed.
- Commons (Low): NotificationRecipient public ctor name-guard now matches the
  ForEmail factory (IsNullOrWhiteSpace). Documented SmsConfiguration.MaxRetries/
  RetryDelay as RESERVED (dispatcher reuses the shared SMTP-derived retry policy).

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Notifications/NotificationLists.razor

@@ -2,6 +2,7 @@
 @using ZB.MOM.WW.ScadaBridge.Security
 @using ZB.MOM.WW.ScadaBridge.Commons.Entities.Notifications
 @using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories
+@using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums
 @attribute [Authorize(Policy = AuthorizationPolicies.RequireDesign)]
 @inject INotificationRepository NotificationRepository
 @inject NavigationManager NavigationManager
@@ -67,7 +68,13 @@
                                 {
                                     @foreach (var r in recipients)
                                     {
-                                        <span class="badge bg-light text-dark me-1 mb-1">@r.Name &lt;@r.EmailAddress&gt;</span>
+                                        @* Type-aware contact: SMS recipients carry a PhoneNumber and a null
+                                           EmailAddress, so an email-shaped badge would render "Name <>". Fall
+                                           back to whichever contact field is populated. *@
+                                        var contact = list.Type == NotificationType.Sms
+                                            ? r.PhoneNumber
+                                            : r.EmailAddress;
+                                        <span class="badge bg-light text-dark me-1 mb-1">@r.Name &lt;@contact&gt;</span>
                                     }
                                 }
                             </td>