Ingest and self-host company/network logos

CompanyBriefOut.logo_path and CompanyDetailOut.logo_path have existed
in the API schemas since Core 0.1's first pass, but nothing ever
actually populated them -- TMDb's production_companies/networks
entries carry a logo_path field that the normalizer simply never read,
so every response has silently returned null there.

- NormalizedCompanyRef now captures logo_path from both movie
  production_companies and series networks/production_companies.
- normalizer.company_logo_artwork() builds the single-image artwork
  entry for it (a company has exactly one logo ingested, so it's
  always is_primary) -- centralized there rather than duplicated in
  both ingestion modules, matching how movie/series artwork URLs are
  already built in one place.
- movie_ingestion.py and series_ingestion.py sync it via the same
  sync_artwork() the rest of section 10's self-hosting already uses,
  so it gets the same re-ingestion-safe upsert behavior for free.
- tasks.py cascades a download_artwork_task per referenced company
  after movie/series ingestion, same fan-out pattern as
  movie/series/season/person artwork.

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

app/services/ingestion/series_ingestion.py

@@ -34,6 +34,7 @@ from app.repositories.provider_repository import get_or_create_provider, upsert_
 from app.services.metadata.matcher import match_entity
 from app.services.metadata.normalizer import (
     NormalizedSeries,
+    company_logo_artwork,
     normalize_season,
     normalize_series,
 )
@@ -94,6 +95,15 @@ async def _replace_series_companies(
             country_code=country_code,
         )
         session.add(SeriesCompany(series_id=series_id, company_id=company.id, role=role))
+        logo = company_logo_artwork(ref.logo_path)
+        if logo is not None:
+            await polymorphic.sync_artwork(
+                session,
+                entity_type="company",
+                entity_id=company.id,
+                provider_id=provider_id,
+                artwork_list=[logo],
+            )
 
 
 async def _replace_series_credits(