Update deploy path, environment URL, nginx conf, and package name
to reflect the new subdomain.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Converts the standalone leaderboard HTML into a proper build project
matching the kingmaker.gateway-gamers.net pattern: shared header/footer
partials in public/, leaderboard logic in src/main.js, and vite build
outputting to dist/.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>