SEO content expansion: compliance guide body, 2 new blog articles, schema

- web-scraping-compliance-uk-guide: filled 7 missing body sections (ToS, IP,
  CMA, best practices, risk matrix, documentation, industry-specific)
  now ~54KB of substantive legal compliance content
- New: blog/articles/web-scraping-lead-generation-uk.php (March 2026)
- New: blog/articles/ai-web-scraping-2026.php (March 2026)
- predictive-analytics-customer-churn: description updated for new title
- index.php: web-scraping-companies added to footer nav
- BreadcrumbList JSON-LD added to data-scraping and web-scraping-companies pages
- sitemap-blog.xml: new articles added

index.php

@@ -1129,6 +1129,7 @@ $twitter_card_image = "https://ukdataservices.co.uk/assets/images/ukds-social-ca
                         <li><a href="/services/price-monitoring">Price Monitoring</a></li>
                         <li><a href="/services/data-cleaning">Data Cleaning</a></li>
                         <li><a href="/services/data-scraping">Data Scraping</a></li>
+                        <li><a href="/services/web-scraping-companies">Compare Providers</a></li>
                         <li><a href="#services">All Services</a></li>
                     </ul>
                 </div>