feat(application): Add AutoMapper profiles for all entities

- EmailProfileMappingProfile: Command→Entity, DTO→Entity, Entity→DTO
- EmailAccountMappingProfile: Command→Entity, Entity→DTO
- EmailHistoryMappingProfile: CreateDto→Entity, UpdateDto partial mapping, Entity→DTO
- EmailAttachmentMappingProfile: CreateDto→Entity, UpdateDto partial mapping, Entity→DTO

All mappings follow Repository<T> pattern with AutoMapper-based CRUD

src/DigitalData.EmailProfiler.Application/Common/Mappings/EmailAccountMappingProfile.cs

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+using AutoMapper;
+using DigitalData.EmailProfiler.Application.Common.Dtos;
+using DigitalData.EmailProfiler.Application.Features.EmailAccounts.Commands;
+using DigitalData.EmailProfiler.Domain.Entities;
+
+namespace DigitalData.EmailProfiler.Application.Common.Mappings;
+
+/// <summary>
+/// AutoMapper profile for EmailAccount entity mappings.
+/// </summary>
+public class EmailAccountMappingProfile : Profile
+{
+    public EmailAccountMappingProfile()
+    {
+        // Command -> Entity (for Create)
+        CreateMap<CreateEmailAccountCommand, EmailAccount>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore()) // Auto-generated
+            .ForMember(dest => dest.AddedWhen, opt => opt.MapFrom(_ => DateTime.Now))
+            .ForMember(dest => dest.AddedWho, opt => opt.MapFrom(_ => "System")) // TODO: Get from user context
+            .ForMember(dest => dest.ChangedWhen, opt => opt.Ignore())
+            .ForMember(dest => dest.ChangedWho, opt => opt.Ignore())
+            .ForMember(dest => dest.Profiles, opt => opt.Ignore());
+
+        // Entity -> DTO (for Queries)
+        CreateMap<EmailAccount, EmailAccountDto>();
+    }
+}

src/DigitalData.EmailProfiler.Application/Common/Mappings/EmailAttachmentMappingProfile.cs

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+using AutoMapper;
+using DigitalData.EmailProfiler.Application.Common.Dtos.EmailAttachments;
+using DigitalData.EmailProfiler.Domain.Entities;
+using DigitalData.EmailProfiler.Domain.Enums;
+
+namespace DigitalData.EmailProfiler.Application.Common.Mappings;
+
+/// <summary>
+/// AutoMapper profile for EmailAttachment entity mappings.
+/// </summary>
+public class EmailAttachmentMappingProfile : Profile
+{
+    public EmailAttachmentMappingProfile()
+    {
+        // DTO -> Entity (for Create)
+        CreateMap<CreateEmailAttachmentDto, EmailAttachment>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore()) // Auto-generated
+            .ForMember(dest => dest.Status, opt => opt.MapFrom(_ => AttachmentStatus.Pending.ToString()))
+            .ForMember(dest => dest.AddedWhen, opt => opt.MapFrom(_ => DateTime.Now))
+            .ForMember(dest => dest.IsEmbeddedFile, opt => opt.MapFrom(_ => false))
+            .ForMember(dest => dest.ParentAttachmentId, opt => opt.Ignore())
+            .ForMember(dest => dest.AttachmentPosition, opt => opt.MapFrom(_ => 0))
+            .ForMember(dest => dest.ValidationErrorCode, opt => opt.Ignore())
+            .ForMember(dest => dest.ValidationErrorMessage, opt => opt.Ignore())
+            .ForMember(dest => dest.Comment, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailHistory, opt => opt.Ignore())
+            .ForMember(dest => dest.ParentAttachment, opt => opt.Ignore())
+            .ForMember(dest => dest.EmbeddedFiles, opt => opt.Ignore());
+
+        // DTO -> Entity (for Update Status)
+        CreateMap<UpdateEmailAttachmentStatusDto, EmailAttachment>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailHistoryId, opt => opt.Ignore())
+            .ForMember(dest => dest.OriginalFileName, opt => opt.Ignore())
+            .ForMember(dest => dest.SavedFileName, opt => opt.Ignore())
+            .ForMember(dest => dest.FilePath, opt => opt.Ignore())
+            .ForMember(dest => dest.FileSize, opt => opt.Ignore())
+            .ForMember(dest => dest.Extension, opt => opt.Ignore())
+            .ForMember(dest => dest.IsEmbeddedFile, opt => opt.Ignore())
+            .ForMember(dest => dest.ParentAttachmentId, opt => opt.Ignore())
+            .ForMember(dest => dest.AttachmentPosition, opt => opt.Ignore())
+            .ForMember(dest => dest.Comment, opt => opt.Ignore())
+            .ForMember(dest => dest.AddedWhen, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailHistory, opt => opt.Ignore())
+            .ForMember(dest => dest.ParentAttachment, opt => opt.Ignore())
+            .ForMember(dest => dest.EmbeddedFiles, opt => opt.Ignore());
+
+        // Entity -> DTO (for Queries)
+        CreateMap<EmailAttachment, EmailAttachmentDto>();
+    }
+}

src/DigitalData.EmailProfiler.Application/Common/Mappings/EmailHistoryMappingProfile.cs

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+using AutoMapper;
+using DigitalData.EmailProfiler.Application.Common.Dtos.EmailHistories;
+using DigitalData.EmailProfiler.Domain.Entities;
+using DigitalData.EmailProfiler.Domain.Enums;
+
+namespace DigitalData.EmailProfiler.Application.Common.Mappings;
+
+/// <summary>
+/// AutoMapper profile for EmailHistory entity mappings.
+/// </summary>
+public class EmailHistoryMappingProfile : Profile
+{
+    public EmailHistoryMappingProfile()
+    {
+        // DTO -> Entity (for Create)
+        CreateMap<CreateEmailHistoryDto, EmailHistory>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore()) // Auto-generated
+            .ForMember(dest => dest.EmailMessageId, opt => opt.Ignore()) // Auto-generated
+            .ForMember(dest => dest.Status, opt => opt.MapFrom(_ => EmailStatus.Processing.ToString()))
+            .ForMember(dest => dest.AddedWhen, opt => opt.MapFrom(_ => DateTime.Now))
+            .ForMember(dest => dest.ProcessedDate, opt => opt.Ignore())
+            .ForMember(dest => dest.ErrorCodeValue, opt => opt.Ignore())
+            .ForMember(dest => dest.ErrorMessage, opt => opt.Ignore())
+            .ForMember(dest => dest.WindreamDocumentId, opt => opt.Ignore())
+            .ForMember(dest => dest.Comment, opt => opt.Ignore())
+            .ForMember(dest => dest.WorkProcess, opt => opt.Ignore())
+            .ForMember(dest => dest.ImapUid, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailSubstring1, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailSubstring2, opt => opt.Ignore())
+            .ForMember(dest => dest.Profile, opt => opt.Ignore())
+            .ForMember(dest => dest.Attachments, opt => opt.Ignore());
+
+        // DTO -> Entity (for Update Status)
+        CreateMap<UpdateEmailHistoryStatusDto, EmailHistory>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore())
+            .ForMember(dest => dest.ProfileId, opt => opt.Ignore())
+            .ForMember(dest => dest.MessageIdHash, opt => opt.Ignore())
+            .ForMember(dest => dest.OriginalMessageId, opt => opt.Ignore())
+            .ForMember(dest => dest.SenderAddress, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailDate, opt => opt.Ignore())
+            .ForMember(dest => dest.Subject, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailBodyText, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailBodyHtml, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailMessageId, opt => opt.Ignore())
+            .ForMember(dest => dest.AddedWhen, opt => opt.Ignore())
+            .ForMember(dest => dest.WindreamDocumentId, opt => opt.Ignore())
+            .ForMember(dest => dest.Comment, opt => opt.Ignore())
+            .ForMember(dest => dest.WorkProcess, opt => opt.Ignore())
+            .ForMember(dest => dest.ImapUid, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailSubstring1, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailSubstring2, opt => opt.Ignore())
+            .ForMember(dest => dest.Profile, opt => opt.Ignore())
+            .ForMember(dest => dest.Attachments, opt => opt.Ignore());
+
+        // Entity -> DTO (for Queries)
+        CreateMap<EmailHistory, EmailHistoryDto>()
+            .ForMember(dest => dest.ProfileName, opt => opt.MapFrom(src => src.Profile != null ? src.Profile.ProfileName : null));
+    }
+}

src/DigitalData.EmailProfiler.Application/Common/Mappings/EmailProfileMappingProfile.cs

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+using AutoMapper;
+using DigitalData.EmailProfiler.Application.Common.Dtos;
+using DigitalData.EmailProfiler.Application.Features.EmailProfiles.Commands;
+using DigitalData.EmailProfiler.Domain.Entities;
+
+namespace DigitalData.EmailProfiler.Application.Common.Mappings;
+
+/// <summary>
+/// AutoMapper profile for EmailProfile entity mappings.
+/// </summary>
+public class EmailProfileMappingProfile : Profile
+{
+    public EmailProfileMappingProfile()
+    {
+        // Command -> Entity (for Create)
+        CreateMap<CreateEmailProfileCommand, EmailProfile>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore()) // Auto-generated
+            .ForMember(dest => dest.AddedWhen, opt => opt.MapFrom(_ => DateTime.Now))
+            .ForMember(dest => dest.AddedWho, opt => opt.MapFrom(_ => "System")) // TODO: Get from user context
+            .ForMember(dest => dest.ChangedWhen, opt => opt.Ignore())
+            .ForMember(dest => dest.ChangedWho, opt => opt.Ignore())
+            .ForMember(dest => dest.LastPollTime, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailAccount, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailProcess, opt => opt.Ignore());
+
+        // Command -> Entity (for Update)
+        CreateMap<UpdateEmailProfileCommand, EmailProfile>()
+            .ForMember(dest => dest.Id, opt => opt.Ignore()) // Don't update ID
+            .ForMember(dest => dest.EmailAccountId, opt => opt.Ignore()) // Don't change account
+            .ForMember(dest => dest.ProcessId, opt => opt.Ignore()) // Don't change process
+            .ForMember(dest => dest.AddedWhen, opt => opt.Ignore())
+            .ForMember(dest => dest.AddedWho, opt => opt.Ignore())
+            .ForMember(dest => dest.ChangedWhen, opt => opt.MapFrom(_ => DateTime.Now))
+            .ForMember(dest => dest.ChangedWho, opt => opt.MapFrom(_ => "System")) // TODO: Get from user context
+            .ForMember(dest => dest.LastPollTime, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailAccount, opt => opt.Ignore())
+            .ForMember(dest => dest.EmailProcess, opt => opt.Ignore());
+
+        // Entity -> DTO (for Queries)
+        CreateMap<EmailProfile, EmailProfileDto>()
+            .ForMember(dest => dest.EmailAccountName, opt => opt.MapFrom(src => src.EmailAccount != null ? src.EmailAccount.AccountName : null))
+            .ForMember(dest => dest.ProcessName, opt => opt.MapFrom(src => src.EmailProcess != null ? src.EmailProcess.ProcessName : null))
+            .ForMember(dest => dest.LastPollTime, opt => opt.MapFrom(src => src.LastPollTime));
+    }
+}