fix: use node http for cron scheduler + add toast notifications

- Replace wget with node http.request in entrypoint (guaranteed
  available, better error handling)
- Add 30s polling in agents page to detect new agent executions
- Show toast notification when an agent finishes (success or failure)
- Add logging in scheduler for visibility in docker logs

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/docker-entrypoint.sh

@@ -8,7 +8,16 @@ node ./node_modules/prisma/build/index.js migrate deploy
 (
   sleep 60
   while true; do
-    wget -q -O /dev/null --post-data='' "http://localhost:3000/api/cron/agents" 2>/dev/null || true
+    node -e "
+      const http = require('http');
+      const req = http.request('http://localhost:3000/api/cron/agents', { method: 'POST' }, (res) => {
+        let body = '';
+        res.on('data', (d) => body += d);
+        res.on('end', () => console.log('[Scheduler] Cron response:', res.statusCode, body));
+      });
+      req.on('error', (e) => console.error('[Scheduler] Cron error:', e.message));
+      req.end();
+    " 2>&1 || true
     sleep 300
   done
 ) &