fix: show DOS logo on welcome page instead of Safe Labs logo

Welcome page hardcoded SafeLabsLogo SVG. Now checks BRAND_LOGO
env var for self-hosted deployments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JOY

apps/web/src/components/welcome/NewSafe.tsx

@@ -3,6 +3,7 @@ import { Typography } from '@mui/material'
 import css from './styles.module.css'
 import WelcomeLogin from './WelcomeLogin'
 import SafeLabsLogo from '@/public/images/logo-safe-labs.svg'
+import { BRAND_LOGO, BRAND_NAME, IS_OFFICIAL_HOST } from '@/config/constants'
 import footerCss from './welcomeFooter.module.css'
 import Footer from '../common/Footer'
 
@@ -11,7 +12,13 @@ const NewSafe = () => {
     <div className={css.loginPage}>
       <div className={css.leftSide}>
         <div className={css.logoContainer}>
-          <SafeLabsLogo className={css.logo} />
+          {IS_OFFICIAL_HOST ? (
+            <SafeLabsLogo className={css.logo} />
+          ) : BRAND_LOGO ? (
+            <img src={BRAND_LOGO} alt={BRAND_NAME} className={css.logo} />
+          ) : (
+            <SafeLabsLogo className={css.logo} />
+          )}
         </div>
         <div className={css.loginContainer}>
           <WelcomeLogin />