Cache: fix 1-year CSS cache and add version busting

- .htaccess: remove duplicate cache block that set all CSS/JS to max-age=31536000
  CSS/JS now use max-age=3600 must-revalidate (was 1 year, breaking live edits)
- index.php: bump main.min.css version v1.1.3 -> v1.1.4
- All 78 PHP files: add ?v=20260222 to main.css and cro-enhancements.css refs
  Forces browser cache bust for all pages after todays accessibility changes

blog/articles/free-web-scraping-tools-launch.php

@@ -22,7 +22,7 @@ $author = "UK Data Services Team";
     <meta property="og:type" content="article">
     <meta property="article:published_time" content="<?php echo $publish_date; ?>">
     
-    <link rel="stylesheet" href="../../assets/css/main.css">
+    <link rel="stylesheet" href="../../assets/css/main.css?v=20260222">
     
     <script type="application/ld+json">
     {