optimize: subject episode resources bind logic.

[chivehao]

• [x] Update the CHANGES log.
• [x] If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.

[codecov[bot]]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (d232508) 47.21% compared to head (5a3ebb5) 47.33%.

Files	Patch %	Lines
...ros/server/core/episode/DefaultEpisodeService.java	21.42%	22 Missing :warning:
...un/ikaros/server/core/episode/EpisodeEndpoint.java	75.00%	13 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #534 +/- ## ============================================ + Coverage 47.21% 47.33% +0.11% - Complexity 691 699 +8 ============================================ Files 162 164 +2 Lines 6150 6230 +80 Branches 330 330 ============================================ + Hits 2904 2949 +45 - Misses 3134 3169 +35 Partials 112 112 ```

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