Add GET /movies/{id}/recommendations

Ingestion already stored movie_recommendations edges from TMDb's
recommendations list (linking only to movies already ingested into
Aurora, per the never-fabricate-a-stub rule), but nothing exposed them.
Adds the repository lookup, service assembly, and route to read them
back in ranked order.

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

app/services/movie_service.py

@@ -14,6 +14,7 @@ from app.schemas.movie import (
     MovieCreditsOut,
     MovieDetailOut,
     MovieImagesOut,
+    MovieRecommendationsOut,
     MovieSummaryOut,
     MovieVideosOut,
 )
@@ -123,6 +124,18 @@ 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_recommendations(
+    session: AsyncSession, movie_aurora_id: str
+) -> MovieRecommendationsOut:
+    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)
+    recommended_ids = await movie_repository.get_movie_recommendation_ids(session, movie_id)
+    summaries = await build_movie_summaries(session, recommended_ids)
+    return MovieRecommendationsOut(id=aurora_id("movie", str(movie.id)), recommendations=summaries)
+
+
 async def build_movie_summary(session: AsyncSession, movie_id: uuid.UUID) -> MovieSummaryOut | None:
     movie = await movie_repository.get_movie_by_id(session, movie_id)
     if movie is None: