Enhance external ID extraction with series fallback

[artifaxx]

Update external ID extraction to fallback to the Series ProviderIds when it's not present on the episode.

Fixes #1209

[gemini-code-assist]

Summary of Changes

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This pull request enhances the robustness of external ID retrieval for Jellyfin webhook events. It introduces a new logic to ensure that if specific external identifiers (like TMDB, IMDb, or TVDB IDs) are missing from an individual media item, the system will attempt to find and utilize these IDs from the parent series, thereby improving data completeness for downstream integrations.

Highlights

• External ID Extraction: Implemented a fallback mechanism for external ID extraction within Jellyfin webhooks. If Tmdb, Imdb, or Tvdb IDs are not found at the episode (item) level, the system now attempts to retrieve them from the associated series' provider IDs.

Changelog

• src/integrations/webhooks/jellyfin.py
  • Modified the _extract_external_ids method to include fallback logic for retrieving Tmdb, Imdb, and Tvdb IDs from the series' ProviderIds if they are not present on the item.

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[gemini-code-assist]

Code Review

This pull request enhances the external ID extraction for Jellyfin webhooks by adding a fallback to series-level provider IDs when they are not available at the episode level. The implementation is functionally correct, but it contains repetitive code. I've suggested a refactoring to make the code more concise and maintainable by removing the duplication.