Install/Restore/Clone/Move with additional-volume support

[stephdl]

Summary

This PR improves node selection and storage handling across install/restore/clone/move flows.

Changes

Node selection

• Show a dedicated message when a node is offline (so users understand why it can’t be selected).
• Fix the disable logic so nodes are disabled when they are non-eligible and/or offline.

Additional disk / volume support

• Allow selecting an additional disk when mountpoints are available from list-mountpoints.
• Improve the UI to surface additional storage availability (node indication + additional volumes selector).

Modals impacted

• InstallAppModal
  • Offline-node feedback
  • Improved step navigation
  • Additional volume selection when offered
• CloneOrMoveAppModal
  • Refactored flow for improved volume selection and navigation
• RestoreSingleInstanceModal
  • Handles additional volumes
  • Improved loading states

Other

• Update i18n prompts/messages for the new UX.
• Bump @nethserver/ns8-ui-lib to 1.11.0.

Notes for testing or review

• install the core version : ./core-install ghcr.io/nethserver/core:sdl-7757
• create an additional disk, mount it to the fstab

fdisk -l
fdisk /dev/sdb
mkfs.ext4 /dev/sdb1
mkdir -p /mnt/data
blkid /dev/sdb1
vim  /etc/fstab
add this example: UUID=109d0947-8cd9-441d-9887-902a3396beea /mnt/data ext4 defaults,nofail 0 2
ls /mnt/data/

the actions list-mountpoints should show your disk

[root@R1-pve ~]# api-cli run node/1/list-mountpoints | jq
{
  "mountpoints": [
    {
      "path": "/mnt/data",
      "label": "",
      "size": 67317051392,
      "used": 7893012480,
      "available": 59424038912,
      "ui_name": "data"
    }
  ],
  "default_disk": {
    "size": 60747141120,
    "used": 11857985536,
    "available": 48889155584,
    "path": "/",
    "label": "",
    "ui_name": ""
  }
}

for a good testing

• test on one node with mattermost (no additional disk possible way), nextcloud (possible additional disk)
• test clone, install, backup and restore
• do the same with two nodes
• test clone, move, install, backup and restore

Refs NethServer/dev#7757

[Copilot]

Pull request overview

This pull request enhances the user interface for application installation, cloning, moving, and restoration by adding offline node detection and volume selection capabilities. The changes convert several modals to wizard-style interfaces and implement comprehensive cluster status checking.

Changes:

• Converted InstallAppModal, CloneOrMoveAppModal, and RestoreSingleInstanceModal from simple modals to multi-step wizards with volume selection
• Added offline node detection and display logic to properly disable nodes that are either non-eligible or offline
• Introduced AdditionnalVolumesSelector component for selecting storage volumes during installation/restoration
• Removed obsolete translation keys that were no longer needed after the UI improvements

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 15 comments.

Show a summary per file

File	Description
InstallAppModal.vue	Converted to wizard with volume selection, added offline node detection and cluster status checking
CloneOrMoveAppModal.vue	Converted to wizard with volume selection, integrated offline node handling into disabled nodes logic
AdditionnalVolumesSelector.vue	New component for displaying and selecting storage volumes with usage information
NodeSelector.vue	Added visual indicator for nodes with additional storage available
RestoreSingleInstanceModal.vue	Extended with volume selection step and offline node detection for backup restoration
translation files	Removed obsolete translation keys and added new keys for volume selection and offline status

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[andre8244]

Just a few minor adjustments then we're done 💪