Match Slavic -ovich/-ovitch surname spelling variants in saint search

[brianglass]

Summary

Follow-up to #175/#176. A search for "John Maximovitch" returned nothing, even though that's an exact substring of an existing saint's name in our data ("St John Maximovitch, Metropolitan of Tobolsk") -- turned out to be two compounding issues:

• The actual exact-spelling match has no story, so it's correctly excluded by the story-less-result filter from Search UX polish and more fragmented saint-identity merges #176.
• The saint people are actually looking for -- St John of Shanghai and San Francisco, a much more famous 20th-century saint who happens to share the same family surname (they're distantly related) -- is spelled "Maximovich" (no "t") in our data, and our transliteration matching didn't cover this pattern.

Added a vitch -> vich rule to normalize_transliteration, alongside the existing Greek rules -- older English convention sometimes rendered the Slavic "-ovich" patronymic ending as "-ovitch". Confirmed via a corpus survey that this is a narrow, low-risk addition: only this one name pair uses either spelling currently.

Test plan

• Full test suite passes (150 tests) against a from-scratch image build
• Manually verified in-browser: searching "John Maximovitch" now redirects straight to St John of Shanghai and San Francisco's page

🤖 Generated with Claude Code

https://claude.ai/code/session_01Hf6j2xXQXywHVh3HAVRxB3