fix: align stage preland picker and demo layout

template.php

@@ -20,7 +20,8 @@
         <meta name="description" content="Онлайн-сервис для автоматического улучшения качества фотографий и изображений с помощью искусственного интеллекта.">
 
 		<?php
-		$baseDemoDir = __DIR__ . "/images/demo/{$indpic}/1";
+		$demoDirName = 'demo' . ($indpic === '1' ? '' : '-' . $indpic);
+		$baseDemoDir = __DIR__ . "/images/{$demoDirName}/1";
 
 		$fSrcMob  = $baseDemoDir . "/source_mob.avif";
 		$fSrcOrig = $baseDemoDir . "/source.avif";
@@ -32,11 +33,11 @@
 		$vResMob  = file_exists($fResMob) ? filemtime($fResMob) : '1';
 		$vResOrig = file_exists($fResOrig) ? filemtime($fResOrig) : '1';
 
-		$urlSrcMob  = "{$assetsUriPrefix}/images/demo/{$indpic}/1/source_mob.avif?v={$vSrcMob}";
-		$urlSrcOrig = "{$assetsUriPrefix}/images/demo/{$indpic}/1/source.avif?v={$vSrcOrig}";
+		$urlSrcMob  = "{$assetsUriPrefix}/images/{$demoDirName}/1/source_mob.avif?v={$vSrcMob}";
+		$urlSrcOrig = "{$assetsUriPrefix}/images/{$demoDirName}/1/source.avif?v={$vSrcOrig}";
 
-		$urlResMob  = "{$assetsUriPrefix}/images/demo/{$indpic}/1/result_mob.avif?v={$vResMob}";
-		$urlResOrig = "{$assetsUriPrefix}/images/demo/{$indpic}/1/result.avif?v={$vResOrig}";
+		$urlResMob  = "{$assetsUriPrefix}/images/{$demoDirName}/1/result_mob.avif?v={$vResMob}";
+		$urlResOrig = "{$assetsUriPrefix}/images/{$demoDirName}/1/result.avif?v={$vResOrig}";
 		?>
 
         <link rel="preload" as="image" href="<?= $urlSrcMob ?>" media="(max-width: 767.98px)" type="image/avif" fetchpriority="high">
@@ -164,4 +165,4 @@ document.addEventListener('DOMContentLoaded', () => {
 });
 </script>
 </body>
-</html>
+</html>