Fix SEO issues found via GSC audit

- Fix broken PHP syntax in real-time data extraction article
- Fix truncated meta description on homepage
- Fix truncated titles on competitive intelligence and price monitoring pages
- Update Selenium vs Playwright article year from 2024 to 2026
- Replace no-store cache headers on homepage with private revalidation
- 301 redirect thin duplicate real-time streaming article to canonical
- Add HSTS header to data-cleaning service page
- Replace SVG og:images with PNG social card across 24 blog articles
- Add Services breadcrumb level to London, Manchester, Birmingham pages

locations/london.php

@@ -10,6 +10,7 @@ $keywords = "web scraping London, data analytics London, data extraction London,
 // Breadcrumb navigation
 $breadcrumbs = [
     ['url' => '/', 'label' => 'Home'],
+    ['url' => '/#services', 'label' => 'Services'],
     ['url' => '', 'label' => 'London']
 ];
 ?>