optimize: EpisodeEndpoint

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 46.66%. Comparing base (8a80481) to head (a1dc22e). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ros/server/core/episode/DefaultEpisodeService.java	0.00%	7 Missing :warning:
...un/ikaros/server/core/episode/EpisodeEndpoint.java	66.66%	3 Missing :warning:
...t/service/impl/AttachmentReferenceServiceImpl.java	0.00%	1 Missing :warning:
...ros/server/core/episode/DefaultEpisodeOperate.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #703 +/- ## ============================================ - Coverage 46.68% 46.66% -0.02% Complexity 846 846 ============================================ Files 204 204 Lines 7634 7650 +16 Branches 393 394 +1 ============================================ + Hits 3564 3570 +6 - Misses 3939 3949 +10 Partials 131 131 ```

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