Create sub folder, delete folder, storage settings, some ui adjustments on threads.

Wino.Core.Domain/Interfaces/IMimeStorageService.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IMimeStorageService
+{
+    Task<string> GetMimeRootPathAsync();
+    Task<Dictionary<Guid, long>> GetAccountsMimeStorageSizesAsync(IEnumerable<Guid> accountIds);
+    Task DeleteAccountMimeStorageAsync(Guid accountId);
+    Task<int> DeleteAccountMimeStorageOlderThanAsync(Guid accountId, DateTime cutoffDateUtc);
+}