- Add shquote() to escape single quotes in paths passed to remote_exec,
preventing shell injection via REMOTE_BASE containing single quotes
- Apply shquote to remote_exec calls in remotes.sh, backup.sh, transfer.sh, ssh.sh
- Add DISK_USAGE_THRESHOLD validation in config.sh
- Export SMTP_PASSWORD (was missing from export list)
- Fix WEB_PORT default mismatch: use 2323 consistently in from_conf and settings save
- Narrow exception catch in remotes.py disk info fetch to KeyError/LookupError
- Quote REMOTE_KEY in build_rsync_ssh_cmd for paths with spaces
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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