- Service Filter Bar: search by name, filter by status (online/offline)
- Batch Operations: multi-select containers for start/stop/restart
- Container Snapshots: create and manage Docker checkpoints
- Added filter bar and batch action bar to index.html
- Added snapshot button to Admin tools section
- New JS modules: service-filter.js, batch-operations.js, snapshot.js
- Updated build.js to include new modules in bundle
