feat(sections): add trending_discover_snapshots table

migrations/166_trending_discover_snapshots.down.sql

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+DROP TABLE IF EXISTS public.trending_discover_snapshots;

migrations/166_trending_discover_snapshots.up.sql

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+-- Persisted snapshot of external global trending (TMDB / Trakt) for the
+-- trending_discover home section. One row per canonical (source, time_window):
+-- content_ids are already resolved to library catalog content IDs and ordered
+-- by trending rank. A background task refreshes these rows; the section read
+-- path only reads them, so a slow or down provider never blocks the home page.
+CREATE TABLE public.trending_discover_snapshots (
+    source          text        NOT NULL,            -- 'tmdb' | 'trakt'
+    time_window     text        NOT NULL,            -- 'day' | 'week' (trakt pinned to 'week')
+    content_ids     text[]      NOT NULL DEFAULT '{}'::text[],
+    entry_count     integer     NOT NULL DEFAULT 0,  -- raw provider entries fetched
+    refreshed_at    timestamptz,                     -- last successful refresh
+    last_attempt_at timestamptz,                     -- last attempt (success or failure)
+    last_status     text        NOT NULL DEFAULT '', -- 'ok' | 'empty' | 'error'
+    last_error      text        NOT NULL DEFAULT '',
+    PRIMARY KEY (source, time_window)
+);