Foundation for the best-in-class discover build. All additive — existing callers unaffected:
- clients.discover() gains keywords (mood/theme), companies (studio), networks (TV), cast/crew
(people), min/max_runtime, certification (+country), vote_count_min override, and release_window
('last_30/90/365', computed date ranges) — each mapped to the right TMDB /discover param + gated
to movie/tv where TMDB requires.
- engine.discover_filter() threads them through + into the cache key.
- engine.trending(window) adds the real-time 'day' chart (cache keyed by window) for a Top 10 row.
- /discover/list parses the new query params and a key=trending_today shortcut.
py_compile + ruff clean. Frontend rails (Top 10, mood, studio, new&upcoming, quick-watches) next.
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