refactor(history): introduce extension method and remove AutoMapper dependency

- Added `CountHistoryQueryExtensions.AnyHistoryAsync` for cleaner query usage via `ISender`.
- Removed `IMapper` from `CountHistoryQueryHandler` as it was unused.
- Removed unnecessary `using` directives to simplify imports.
- Kept query handling logic intact.

EnvelopeGenerator.Application/Histories/Queries/HistoryQueryBase.cs

@@ -13,10 +13,10 @@ public record HistoryQueryBase
     /// Die eindeutige Kennung des Umschlags.
     /// </summary>
     [Required]
-    public int EnvelopeId { get; init; }
+    public int EnvelopeId { get; set; }
 
     /// <summary>
     /// Der Include des Umschlags, der abgefragt werden soll. Kann optional angegeben werden, um die Ergebnisse zu filtern.
     /// </summary>
-    public EnvelopeStatus? Status { get; init; }
+    public EnvelopeStatus? Status { get; set; }
 }