OPDS Enhancements, Epub fixes, and a lot more (#4035)

Co-authored-by: Amelia <77553571+Fesaa@users.noreply.github.com>
Co-authored-by: Robbie Davis <robbie@therobbiedavis.com>
Co-authored-by: Fabian Pammer <fpammer@mantro.net>
Co-authored-by: Vinícius Licz <vinilicz@gmail.com>

API/Controllers/SettingsController.cs

@@ -71,6 +71,9 @@ public class SettingsController : BaseApiController
     public async Task<ActionResult<ServerSettingDto>> GetSettings()
     {
         var settingsDto = await _unitOfWork.SettingsRepository.GetSettingsDtoAsync();
+
+        // Do not send OIDC secret to user
+        settingsDto.OidcConfig.Secret = "*".Repeat(settingsDto.OidcConfig.Secret.Length);
         return Ok(settingsDto);
     }