fix: recursive data nesting guard + VM destroy in uninstall wizard

- Cleaned 242MB of recursive data/data/data/ nesting
- Added nesting-guard.js: auto-detects and removes recursive duplicates at startup
- Wired VM sandbox cleanup into uninstall wizard (calls vmDestroy before regular uninstall)
- Container stats, health data, and VM disk all cleaned on uninstall

dashcaddy-api/src/app.js

@@ -28,6 +28,7 @@ const auditLogger = require('./security/audit-logger');
 const portLockManager = require('./managers/port-lock-manager');
 const resourceMonitor = require('./managers/resource-monitor');
 const backupManager = require('./utilities/backup-manager');
+require("./utilities/nesting-guard")();
 const healthChecker = require('./monitoring/health-checker');
 const updateManager = require('./managers/update-manager');
 const selfUpdater = require('./docker/self-updater');