fix(stream): update stream request timeouts for PenguPlay and debrid addons

[Himanth-reddy]

Stacked on PR #523

Summary

Fixes an issue where PenguPlay and other remote/debrid stream addons fail to fetch streams for TV show episodes (returning 0 streams).

Problem

• Cold requests for PenguPlay episode streams take ~4.3s.
• was hardcoded to 4.0s (4000ms), causing single stream requests to be aborted 300ms before responses arrived.
• PenguPlay was not included in .

Solution

1. Included in so PenguPlay receives the 18s aggregator stream request timeout window.
2. Increased default from 4.0s to 8.0s to prevent early cancellations on cold queries.
3. Added unit test coverage for TMDB episode candidate resolution on series streams.

[Himanth-reddy]

Replaced by same-repository stacked PR #526