The general/curated rails (Popular/Trending/Top Rated + genre/decade) pull TMDB's GLOBAL lists,
flooding feeds with foreign-language titles (Bollywood). Add a multi-language preference:
- _disc_map now carries original_language (+ popularity) on each item.
- discover_languages setting (default 'en'); /discover/list post-filters general/curated rails
to it (dropping known non-preferred-language titles) and pages deeper to keep rails full.
Rails with an explicit lang (the dedicated foreign rails) bypass the filter.
- GET/POST /discover/languages to read/set the preference.
- Removed the hardcoded lang=en on general rails (the setting drives it now).
Default 'en' immediately fixes the Bollywood flood; UI to pick languages next.
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