fix(install): address CodeRabbit review round 2

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- Workflow: use github.ref for the concurrency group so distinct PRs from the
  same source branch don't cancel each other
- Workflow: extract the generated DB password from the installer's 'Password:'
  output and verify the 'ospos' account can authenticate with DB_PASS
- Installer: set the MariaDB root password and FLUSH PRIVILEGES in one session,
  pass the root password via a private 0600 defaults file (no argv exposure),
  and scope the SQL account to the 'localhost' client host
- Docs: interactive mode requires a tty (download-then-run, not a pipe);
  clarify SSL_EMAIL needs a public hostname to enable Let's Encrypt

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