[Feature Request] Add disk expansion functionality to web UI or provide automated script for SD card resize

[simeononsecurity]

Problem

When using larger SD cards (e.g., 512GB) with BELABOX, the filesystem only uses a small portion (~3.6GB) of the available space by default. This causes:

• Software update failures due to insufficient storage space (E: You don't have enough free space in /var/cache/apt/archives/)
• Inability to store recordings or other data
• Manual intervention requiring SSH access and command-line expertise

Current Manual Process

Users must currently SSH into the device and manually:

1. Use parted /dev/mmcblk1 resizepart 1 100% to expand the partition
2. Run partprobe to re-read the partition table
3. Execute resize2fs /dev/mmcblk1p1 to expand the filesystem
4. This requires technical knowledge and is error-prone

Proposed Solutions

Option 1: Web UI Integration (Preferred)

Add a "Storage Management" section to the BELABOX web interface with:

• Display current disk usage and available expansion
• One-click "Expand to Full Disk" button
• Progress indicator during expansion
• Warning about not powering off during the process

Option 2: Automatic Detection

• Automatically detect undersized filesystems on boot
• Present expansion option in web UI with clear explanation
• Optional: Auto-expand on first boot (with user confirmation)

Option 3: Documentation + Script

• Provide comprehensive documentation for manual expansion
• Include a ready-to-use script: /usr/local/bin/belabox-expand-disk
• Add to FAQ/troubleshooting guides

Expected Behavior

• Users with large SD cards should be able to utilize full storage capacity
• No software update failures due to storage constraints
• Simple, safe process accessible to non-technical users

Technical Notes

• Tested on custom kernel 5.10.160-belabox
• Uses GPT partition table on /dev/mmcblk1
• Single ext4 partition that needs expansion
• Process works but requires manual intervention

[simeononsecurity]

Addressed, documentation wise, in https://github.com/BELABOX/tutorial/wiki/SSH-Setup-and-Disk-Expansion-for-BELABOX