Introduce interactive whiptail-based helpers and robust error handling for VM creation.
- Add error_handler() to report failures (calls post_update_to_api if available), print contextual error info, and call cleanup_vmid.
- Ensure TEMP_DIR is removed in cleanup().
- Replace brittle pve_check with version parsing that supports Proxmox VE 8.0–8.9 and 9.0–9.1 (exits with code 105 on unsupported versions).
- Add ssh_check() to warn users running the script over SSH.
- Add sanitize_vm_hostname() and a suite of vm_* helper functions to prompt and validate interactive settings via whiptail: vm_confirm_new_vm, vm_choose_settings_mode, vm_prompt_vmid, vm_prompt_machine_type, vm_apply_machine_type, vm_prompt_disk_size, vm_prompt_disk_cache, vm_prompt_hostname, vm_prompt_cpu_model, vm_prompt_cpu_cores, vm_prompt_ram, vm_prompt_bridge, vm_prompt_mac, vm_prompt_vlan, vm_prompt_mtu, vm_prompt_start_vm.
- Add storage helpers: vm_select_storage, vm_apply_storage_layout, vm_define_disk_references to detect storage pools, set formats/extensions and prepare disk refs.
- Use APP/NSAPP for description title by introducing local description_title in set_description().
These changes centralize validation and interactive flow, improve UX, and harden error reporting and cleanup.
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