SEO polish: hreflang, speakable schema, GSC-driven titles
- en-GB locale and hreflang — UK-targeted locale tags across every page.
- GSC-driven titles — detail-page meta titles are now rewritten using the actual queries pulling traffic from Google Search Console.
- Speakable schema — added on subject and university pages so voice assistants can read the right summary.
- Persistent cache — moved hot lookups behind a persistent layer; slug index added to speed up resolution.
- Bot-aware Sentry — crawler traffic no longer pollutes the error feed.