feat: show configured taps count on Admin App Config overview

New Taps column shows enabled/total count as a badge (e.g. "2/3")
next to the existing Traced column.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AppConfigPage.tsx

@@ -102,6 +102,17 @@ export default function AppConfigPage() {
           : <MonoText size="xs">0</MonoText>;
       },
     },
+    {
+      key: 'taps',
+      header: 'Taps',
+      width: '70px',
+      render: (_val, row) => {
+        const total = row.taps?.length ?? 0;
+        const enabled = row.taps?.filter(t => t.enabled).length ?? 0;
+        if (total === 0) return <MonoText size="xs">0</MonoText>;
+        return <Badge label={`${enabled}/${total}`} color="running" variant="filled" />;
+      },
+    },
     {
       key: 'version',
       header: 'v',