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/categories/web-scraping.php

@@ -23,7 +23,7 @@ $og_image = "https://ukdataservices.co.uk/assets/images/blog/web-scraping-catego
     <link rel="canonical" href="<?php echo htmlspecialchars($canonical_url); ?>">
     
     <!-- Preload critical resources -->
-    <link rel="preload" href="../../assets/css/main.css" as="style">
+    <link rel="preload" href="../../assets/css/main.css?v=20260222" as="style">
     <link rel="preload" href="../../assets/images/ukds-main-logo.png" as="image">
     
     <!-- Open Graph / Social Media -->
@@ -49,7 +49,7 @@ $og_image = "https://ukdataservices.co.uk/assets/images/blog/web-scraping-catego
     <link href="https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@300;400;500;600;700&family=Lato:wght@300;400;500;600;700&display=swap" rel="stylesheet">
     
     <!-- Styles -->
-    <link rel="stylesheet" href="../../assets/css/main.css">
+    <link rel="stylesheet" href="../../assets/css/main.css?v=20260222">
     
     <!-- Category Schema -->
     <script type="application/ld+json">