Threads the caller's Accept-Language preference into ForwardGeocoder
and uses it in rerank_by_query to check whether the query matches the
localized name of a country result.
If the caller's locale renders the country name differently (e.g. pt-BR
gives "Brasil" ≠ "Brasilia"), the country's importance is added as an
accuracy penalty, neutralising its dominance over lower-ranked places.
If the locale matches (e.g. Finnish gives "Brasilia" = "Brasilia"),
no penalty is applied and the country correctly wins.
Introduces a mechanism to defer the search endpoint's availability check until the first request, improving startup robustness. If the search table is unavailable due to DB issues, the endpoint now responds with a 503 or 404 as appropriate, and retries the check on subsequent requests. This ensures that downtime or partial DB failures no longer prevent the API from initializing or serving reverse-only mode.
Removed auto-localization from search/search_address APIs (now explicit), simplified AddressLines to subclass List[AddressLine], made display_name a computed property in Results instead of field and removed result-localization circular dependencies
