Make the panel actually operate the server, not just display it — for everything
that works in the SSH user's own space (no sudo required).
- FleetService: addAuthorizedKey (append, dedup, perms-safe via base64 transport),
removeAuthorizedKey (by SHA256 fingerprint, preserves every other key — never
rewrites blindly, no lockout), sshKeys (reload), deleteFile (SFTP unlink).
- AddSshKey form modal: paste a public key -> appended over SSH + AuditEvent +
list reload. Wired to the "Schlüssel hinzufügen" button on Server-Details.
- Server-Details: key removal now performs the real SSH removal then reloads;
new "Dateien" button opens the file manager scoped to this server.
- Files: delete performs the real SFTP unlink then reloads the directory.
Verified live: add+remove of a throwaway key leaves the existing key intact;
real file delete confirmed gone. systemctl start/stop/restart still need a
privileged credential (the demo account has no passwordless sudo).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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