feat(admin): add pending tag suggestions detector

server/utils/adminAlerts.js

@@ -226,4 +226,35 @@ export async function detectEventsNearCapacity() {
   }
 }
 
+export async function detectPendingTagSuggestions() {
+  await connectDB()
+  const suggestions = await TagSuggestion
+    .find({ status: 'pending' })
+    .select('_id')
+    .lean()
+  if (suggestions.length === 0) {
+    return {
+      type: 'tag_suggestions_pending',
+      severity: 'attention',
+      title: 'Pending tag suggestions',
+      items: []
+    }
+  }
+  return {
+    type: 'tag_suggestions_pending',
+    severity: 'attention',
+    title: 'Pending tag suggestions',
+    items: [
+      {
+        id: 'tag-suggestions',
+        label: `${suggestions.length} pending tag suggestion${suggestions.length === 1 ? '' : 's'}`,
+        sublabel: 'Review and approve in Tags',
+        href: '/admin/tags'
+      }
+    ],
+    // signature is computed from the underlying suggestion ids, not the rendered item id
+    signatureIds: suggestions.map((s) => String(s._id))
+  }
+}
+
 // Aggregator lands in task 8.