- Implement list_backup_jobs with full job configuration parsing
- Implement create_backup_job and update_backup_job
- Implement delete_backup_job and trigger_backup_job (manual execution)
- Implement list_datastores and get_datastore_status
- Implement list_backup_snapshots and restore_backup
- All operations use proper error handling with Option safety
- Add 2 unit tests for backup job and datastore info serialization
- Add proxmox module with client, cluster, and resource management
- Implement VM management stubs with full API documentation
- Add database migrations for proxmox_clusters and proxmox_resources tables
- Implement IPC commands for cluster CRUD operations
- Add Proxmox state management to AppState
- Create 22 unit tests for Proxmox modules (all passing)
- Update lib.rs, state.rs, and integrations.rs for Proxmox integration
