feat(notification): add admin rest management and deletion

Add revision-safe service and template APIs, channel mapping, and validated admin controls.

Ref: IT-1601

HrynCo.NotificationService.Web/wwwroot/css/admin.css

@@ -20,7 +20,10 @@ body {
 .admin-navbar {
     border-bottom: 1px solid rgba(255,255,255,.07);
     box-shadow: 0 2px 6px rgba(0,0,0,.4);
-    height: 52px;
+    min-height: 52px;
+    align-items: center;
+    gap: .5rem;
+    padding-inline: 1rem;
 }
 
 .admin-navbar .navbar-brand {
@@ -29,6 +32,27 @@ body {
     letter-spacing: .02em;
 }
 
+.admin-api-documentation {
+    margin-left: auto;
+    padding-block: .25rem;
+    color: #f8f9fa;
+    font-size: .85rem;
+    white-space: nowrap;
+}
+
+.admin-api-documentation:hover { color: #fff; }
+
+.admin-api-documentation:focus-visible {
+    outline: 2px solid #f8f9fa;
+    outline-offset: 3px;
+}
+
+@media (max-width: 575.98px) {
+    .admin-navbar { padding-inline: .5rem; }
+    .admin-navbar .navbar-brand { margin-right: 0; font-size: .85rem; }
+    .admin-api-documentation { font-size: .8rem; }
+}
+
 /* ── Sidebar ──────────────────────────────────────────── */
 .sidebar {
     min-height: calc(100vh - 52px);
@@ -109,21 +133,44 @@ body {
 .table tbody tr td { vertical-align: middle; }
 .table thead th { font-size: .75rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
 
+/* ── Administration list grids ────────────────────────── */
+.admin-data-table { border: 1px solid #b8c4d3; }
+
+.admin-data-table :is(a, button, input, select, textarea) { scroll-margin-inline: .5rem; }
+
+.admin-data-table > thead > tr > th {
+    --bs-table-bg: #dce7f6;
+    --bs-table-color: #243a55;
+    border-bottom: 2px solid #aec0db;
+    vertical-align: middle;
+}
+
+.admin-data-table > tbody > tr > td:first-child { overflow-wrap: anywhere; }
+
+.admin-data-table > :not(caption) > * > * + * {
+    border-left: 1px solid #b8c4d3;
+}
+
+.admin-data-table .list-action-links { display: inline-flex; align-items: center; gap: .375rem; }
+.admin-delete-confirmation { overflow-wrap: anywhere; }
+
 /* ── List actions ─────────────────────────────────────── */
-.table .template-actions,
-.table .service-actions {
+.admin-data-table .template-actions,
+.admin-data-table .service-actions,
+.admin-data-table .channel-actions {
     width: 1%;
     white-space: nowrap;
     text-align: right;
 }
 
-/* ── Service template catalog and filters ─────────────── */
-.service-template-grid > thead > tr > th {
-    --bs-table-bg: #dce7f6;
-    --bs-table-color: #243a55;
-    border-bottom: 2px solid #aec0db;
+.page-header .service-template-service-name {
+    min-width: 0;
+    overflow-wrap: anywhere;
 }
 
+.service-template-service-name + .btn { flex-shrink: 0; }
+
+/* ── Service template catalog and filters ─────────────── */
 .service-template-grid .template-key-filter .btn-outline-secondary {
     --bs-btn-bg: #fff;
 }
@@ -154,6 +201,7 @@ body {
 
 .template-key-filter-controls {
     display: flex;
+    align-items: center;
     flex-wrap: wrap;
     gap: .375rem;
 }
@@ -302,7 +350,9 @@ body {
 }
 
 /* ── Template service context ─────────────────────────── */
-.template-editor-breadcrumbs .breadcrumb-item {
+.template-editor-breadcrumbs .breadcrumb-item,
+.service-template-breadcrumbs .breadcrumb-item,
+.service-editor-breadcrumbs .breadcrumb-item {
     min-width: 0;
     max-width: 100%;
     overflow-wrap: anywhere;
@@ -473,7 +523,7 @@ body {
 
 .template-preview-frame {
     width: 100%;
-    height: 420px;
+    height: 80px;
     border: 1px solid #cfd8e3;
     border-radius: .5rem;
     background: #eef2f7;
@@ -495,9 +545,6 @@ body {
         grid-template-columns: 1fr;
     }
 
-    .template-preview-frame {
-        height: 360px;
-    }
 }
 
 /* ── Form-section divider ─────────────────────────────── */