When "docker version --format json" did not return clean JSON (for
example, text from a shell startup file), validation stored 0.0.0 and
said that Docker was older than version 24. Validation now stores no
version and tells the user to run the command on the server. When the
version is too old, the message shows the detected version.
Closes#11089
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Escape dynamic error messages with htmlspecialchars() before
concatenating into HTML strings stored in validation_logs. Add a
Purify-based mutator on Server model as defense-in-depth, with a
dedicated HTMLPurifier config that allows only safe structural tags.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>