Replace DateTime.UtcNow with DateTime.Now for timestamps

Switched all audit and creation timestamps from UTC to local time
by replacing DateTime.UtcNow with DateTime.Now across the codebase.
This affects audit fields, object creation, and default values for
date/time properties.

EnvelopeGenerator.Application/DocStatus/MappingProfile.cs

@@ -27,7 +27,7 @@ public class MappingProfile : Profile
         CreateMap<UpdateDocStatusCommand, DocumentStatus>()
         .ForMember(dest => dest.Envelope, opt => opt.Ignore())
         .ForMember(dest => dest.Receiver, opt => opt.Ignore())
-        .ForMember(dest => dest.StatusChangedWhen, opt => opt.MapFrom(src => DateTime.UtcNow))
+        .ForMember(dest => dest.StatusChangedWhen, opt => opt.MapFrom(src => DateTime.Now))
         .MapChangedWhen();
     }
 }