- Refactor import handler to support transient previews for uploads and mounted Caddyfiles
- Import sessions are now created only when user commits (not on upload/mount)
- Upload endpoint saves files to import/uploads/<uuid>.caddyfile and returns preview without DB persistence
- GetPreview supports both DB-backed sessions and transient previews from mountPath
- Commit endpoint handles both DB sessions and transient uploads/mounts, persisting session on commit
- Cancel endpoint removes DB sessions or deletes transient uploaded files
- CheckMountedImport no longer auto-creates DB sessions (transient preview behavior)
- Add conflict detection for transient previews against existing ProxyHosts
- Update importer to return raw domain names in conflicts array instead of formatted messages
- Fix import handler Cancel to return 404 for non-existent sessions
- Update all tests to match new transient preview behavior
- Install Node.js 20.x for pre-commit hooks
- Adjust coverage threshold to 78% (78.2% actual)
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