fix(i18n): keep locale on website->dashboard links; dashboard defaults to fa

Marketing-site login/register/dashboard links were locale-less (app.meezi.ir/login), so the dashboard auto-detected locale from the browser Accept-Language (en-US) and redirected Persian users to /en. Links now carry the current locale, and the dashboard sets localeDetection:false so any locale-less entry defaults to fa (Iran-first) instead of guessing from the browser.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/website/src/components/sections/launch-countdown-section.tsx

@@ -101,7 +101,7 @@ export function LaunchCountdownSection() {
             </div>
 
             <a
-              href="https://app.meezi.ir/register"
+              href={`https://app.meezi.ir/${locale}/register`}
               className={cn(
                 "inline-flex items-center justify-center rounded-xl bg-brand-700 px-6 py-3 text-sm font-semibold text-white",
                 "transition hover:bg-brand-800 focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-700 focus-visible:ring-offset-2"