Add device path validation before growpart and resize2fs operations

[Copilot]

Addresses feedback to validate device paths before passing them to potentially destructive commands like growpart and resize2fs.

Validation added:

• Pattern matching: Ensures DISK matches expected block device patterns (/dev/sd[a-z]*, /dev/nvme[0-9]*n[0-9]*, /dev/mmcblk[0-9]*, /dev/vd[a-z])
• Block device verification: Confirms both DISK and SSD_DEV exist and are block devices using -b test
• Partition range check: Validates PART is within 1-128 range with error suppression

All validations occur before destructive operations:

# Validate device paths before proceeding with potentially destructive operations
case "$DISK" in
    /dev/sd[a-z]|/dev/sd[a-z][a-z]|/dev/nvme[0-9]*n[0-9]*|/dev/mmcblk[0-9]*|/dev/vd[a-z])
        # Valid block device pattern
        ;;
    *)
        echo "grow-ssd: device path '$DISK' does not match expected block device patterns; skipping for safety"
        sv down /var/service/grow-ssd >/dev/null 2>&1 || true
        exit 0
        ;;
esac

# Ensure DISK exists and is a block device
if ! [ -b "$DISK" ]; then
    echo "grow-ssd: '$DISK' is not a block device; skipping"
    sv down /var/service/grow-ssd >/dev/null 2>&1 || true
    exit 0
fi

Patterns support multi-digit device numbers (e.g., /dev/nvme10n1, /dev/mmcblk10).

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[kristapsk]

It's overkill.