* Add MySQL/MariaDB variable capability matrix to Database section
* Add changelog fragment for PR #8188
* Address review: correct version boundaries, escaping, valid values, focusable hint, unit tests
* Normalize server version suffixes and cache the capability matrix
* Add capability matrix strings to the translation template
* Treat an unknown (null/empty) server version as supported to avoid a TypeError
* Cover the capability helpers in the installer coverage suite
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Co-authored-by: TheWitness <copilot@users.noreply.github.com>