Description

1. Reference documentation: https://theintrodb.org/docs. The start_ms for both the intro and the recap can be null.

2. When IgnoreMediaWithExistingSegments is enabled, returning an empty array will cause Jellyfin to delete existing segments. To retain segments, need to return the existing segments array.
   Jellyfin code reference: https://github.com/jellyfin/jellyfin/blob/bc074b5283add16818ce598890f53ce9432cd4ad/Jellyfin.Server.Implementations/MediaSegments/MediaSegmentManager.cs#L127

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings