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/locales/en.json

@@ -1296,7 +1296,9 @@
       "toggleError": "Error toggling agent",
       "installSuccess": "\"{name}\" installed",
       "installError": "Error during installation",
-      "saveError": "Error saving"
+      "saveError": "Error saving",
+      "autoRunSuccess": "Agent \"{name}\" executed automatically with success",
+      "autoRunError": "Agent \"{name}\" failed during automatic execution"
     },
     "templates": {
       "title": "Templates",