Move Node.js-only functions (evalConfigFileContent, tryEvalConfigFileContent,
detectImportPackageFromDir) to new config-eval.ts. This prevents the dashboard
browser build from failing on fs/path/jiti imports.
Dashboard now uses parseStaticConfigLiteral (regex+JSON.parse) instead of
jiti eval for untrusted GitHub-fetched config content, avoiding RCE risk.
Remove type casts in favor of isRecord type guard.
Co-Authored-By: mantra <mantra@stack-auth.com>
f71cde84b8