[Feature] TTRSS Media Cache cannot be used

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In order to deal with the problem of image loading, I turned on the media caching feature of TTRSS subscription links. However, I found that the TTRSS Fever API plug-in cannot use media caching. After repeated verification, TTRSS itself has cached the images, but the reader linked through the plug-in still needs to be downloaded again. I think this should be a different consideration in the production of plug-ins, and I hope to solve this problem.