Add watch providers (where to stream/rent/buy)

New TMDb integration end to end: append_to_response "watch/providers",
normalizer parsing grouped by country/monetization type, a WatchProvider
catalog entry (external-id keyed, same get_or_create pattern as Company/
Collection/Person) + polymorphic WatchProviderOffering table (new
migration 0002), ingestion write (including provider logos via the
existing Artwork table), and API exposure -- embedded on movie/series
detail plus a dedicated /watch-providers sub-route, shaped to mirror
TMDb's own response for easy porting.

Note: this data comes from JustWatch via TMDb and carries its own
attribution requirement separate from TMDb's general one -- flagged in
docs/api.md, must be satisfied before showing this in the frontend.

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

app/services/movie_service.py

@@ -19,8 +19,10 @@ from app.schemas.movie import (
     MovieRecommendationsOut,
     MovieSummaryOut,
     MovieVideosOut,
+    MovieWatchProvidersOut,
 )
 from app.services.common import (
+    build_watch_providers_out,
     pick_certification,
     primary_artwork_path,
     split_credits,
@@ -60,6 +62,7 @@ async def get_movie_detail(session: AsyncSession, movie_aurora_id: str) -> Movie
     artwork = await polymorphic.get_artwork(session, "movie", movie_id)
     videos = await polymorphic.get_videos(session, "movie", movie_id)
     release_dates = await polymorphic.get_release_dates(session, "movie", movie_id)
+    watch_provider_rows = await polymorphic.get_watch_providers(session, "movie", movie_id)
     external_ids = await polymorphic.get_external_ids(session, "movie", movie_id)
 
     cast, crew = split_credits(credits_)
@@ -114,6 +117,7 @@ async def get_movie_detail(session: AsyncSession, movie_aurora_id: str) -> Movie
         images=to_images_out(artwork),
         videos=[to_video_out(v) for v in videos],
         release_dates=[to_release_date_out(rd) for rd in release_dates],
+        watch_providers=await build_watch_providers_out(session, watch_provider_rows),
         external_ids=external_ids,
         created_at=movie.created_at,
         updated_at=movie.updated_at,
@@ -148,6 +152,19 @@ async def get_movie_videos(session: AsyncSession, movie_aurora_id: str) -> Movie
     return MovieVideosOut(id=aurora_id("movie", str(movie.id)), videos=[to_video_out(v) for v in videos])
 
 
+async def get_movie_watch_providers(
+    session: AsyncSession, movie_aurora_id: str
+) -> MovieWatchProvidersOut:
+    movie_id = await _resolve_movie_id(movie_aurora_id)
+    movie = await movie_repository.get_movie_by_id(session, movie_id)
+    if movie is None:
+        raise MovieNotFoundError(movie_aurora_id)
+    rows = await polymorphic.get_watch_providers(session, "movie", movie_id)
+    return MovieWatchProvidersOut(
+        id=aurora_id("movie", str(movie.id)), results=await build_watch_providers_out(session, rows)
+    )
+
+
 async def get_movie_recommendations(
     session: AsyncSession, movie_aurora_id: str
 ) -> MovieRecommendationsOut: