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/schemas/movie.py

@@ -17,6 +17,7 @@ from app.schemas.common import (
     KeywordOut,
     ReleaseDateOut,
     VideoOut,
+    WatchProviderRegionOut,
 )
 
 
@@ -66,12 +67,18 @@ class MovieDetailOut(BaseModel):
     images: ImagesOut = ImagesOut()
     videos: list[VideoOut] = []
     release_dates: list[ReleaseDateOut] = []
+    watch_providers: dict[str, WatchProviderRegionOut] = {}
     external_ids: dict[str, str] = {}
 
     created_at: datetime
     updated_at: datetime
 
 
+class MovieWatchProvidersOut(BaseModel):
+    id: str
+    results: dict[str, WatchProviderRegionOut] = {}
+
+
 class MovieCreditsOut(BaseModel):
     id: str
     cast: list[CastCreditOut] = []