Add trending movies/series, refreshed on a schedule

Mirrors TMDb's own /trending/{movie|tv}/{day|week} ranking rather than
Aurora computing trending itself from popularity deltas -- that would
require re-syncing the entire catalog on a schedule, infeasible at any
real scale, whereas TMDb already computes this well from signals (real
view/search velocity) Aurora has no access to.

New: TrendingEntry model + migration 0003, MetadataProvider.get_trending
(concrete/optional, like aclose(), so existing test fakes don't all need
updating), refresh_trending() which actually ingests each trending item
(only ~20 per window, cheap enough to fully ingest rather than apply the
never-fabricate-a-stub rule recommendations uses), a twice-daily arq cron
job (WorkerSettings.cron_jobs, new to this codebase), a manual admin
trigger for right after a deploy, and GET /movies/trending + GET
/series/trending.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

app/workers/tasks.py

@@ -19,6 +19,7 @@ from typing import Any
 
 from app.core.database import session_scope
 from app.core.logging import get_logger
+from app.providers.tmdb import TMDbProvider
 from app.services.artwork.download import download_artwork
 from app.services.artwork.storage import get_artwork_storage
 from app.services.ingestion.runner import (
@@ -34,6 +35,7 @@ from app.services.ingestion.runner import (
     run_season_ingestion,
     run_series_ingestion,
 )
+from app.services.ingestion.trending_ingestion import refresh_trending
 
 logger = get_logger(__name__)
 
@@ -112,3 +114,18 @@ async def ingest_collection_task(ctx: dict[str, Any], job_id: str, external_id:
 async def download_artwork_task(ctx: dict[str, Any], artwork_id: str) -> bool:
     async with session_scope() as session:
         return await download_artwork(session, get_artwork_storage(), uuid.UUID(artwork_id))
+
+
+async def refresh_trending_task(ctx: dict[str, Any]) -> None:
+    """Runs on a schedule (see WorkerSettings.cron_jobs in
+    app/workers/worker.py) -- not tracked in ingestion_jobs, same as
+    download_artwork_task, since there's no single external_id a client
+    would poll status for."""
+
+    provider = TMDbProvider()
+    try:
+        for media_type in ("movie", "tv"):
+            for time_window in ("day", "week"):
+                await refresh_trending(provider, media_type, time_window)
+    finally:
+        await provider.aclose()