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

blog/articles/real-time-data-extraction-technical-guide-uk-businesses.php

@@ -1,5 +1,5 @@
 <?php
- = 'Michael Thompson';
+$article_author = 'Michael Thompson';
 // Enhanced security headers
 header('Strict-Transport-Security: max-age=31536000; includeSubDomains');