Folder Watching Polish + Epub Fix (#1550)

* Fixed entrypoint writing bad json (from develop)

* Fixed a bug where log file could write out a crap ton of information (serializing Series object) when a db error occurs.

* Fixed an issue with scan loop where concurrency issues could occur on new series being added.

* Tweaked the logger to suppress some noisy logs when using Debug log level.

* Fixed a regression with epub parsing from v3.2 of Vers-One's release

* Fixed up folder watching to work more reliable. Validated in production.

* Code cleanup

API/DTOs/Filtering/FilterDto.cs

@@ -99,8 +99,10 @@ public class FilterDto
     /// An optional name string to filter by. Empty string will ignore.
     /// </summary>
     public string SeriesNameQuery { get; init; } = string.Empty;
+    #nullable enable
     /// <summary>
     /// An optional release year to filter by. Null will ignore. You can pass 0 for an individual field to ignore it.
     /// </summary>
     public Range<int>? ReleaseYearRange { get; init; } = null;
+    #nullable disable
 }