refactor(application): Reorganize DTOs - flatten single-DTO folders

- Move EmailAccountDto.cs to Dtos/ (was in EmailAccounts/ subfolder)
- Move EmailProfileDto.cs to Dtos/ (was in EmailProfiles/ subfolder)
- Keep EmailAttachments/ (3 DTOs) and EmailHistories/ (3 DTOs) subfolders
- Update all namespace imports from Dtos.EmailAccounts/EmailProfiles to Dtos
- Simpler structure: single DTOs at root, multiple DTOs in subfolders

src/DigitalData.EmailProfiler.Application/Common/Dtos/CommonDtos.cs

@@ -1,54 +0,0 @@
-namespace DigitalData.EmailProfiler.Application.Common.Dtos;
-
-public class EmailProfileDto
-{
-    public int Id { get; set; }
-    public string ProfileName { get; set; } = string.Empty;
-    public int EmailAccountId { get; set; }
-    public string? EmailAccountName { get; set; }
-    public int? ProcessId { get; set; }
-    public string? ProcessName { get; set; }
-    public int PollIntervalMinutes { get; set; }
-    public DateTime? LastPollTime { get; set; }
-    public bool IsActive { get; set; }
-    public string? Comment { get; set; }
-}
-
-public class EmailAccountDto
-{
-    public int Id { get; set; }
-    public string AccountName { get; set; } = string.Empty;
-    public string ImapServer { get; set; } = string.Empty;
-    public int ImapPort { get; set; }
-    public string SmtpServer { get; set; } = string.Empty;
-    public int SmtpPort { get; set; }
-    public string Username { get; set; } = string.Empty;
-    public bool UseOAuth2 { get; set; }
-    public bool IsActive { get; set; }
-}
-
-public class EmailHistoryDto
-{
-    public int Id { get; set; }
-    public int? ProfileId { get; set; }
-    public string? ProfileName { get; set; }
-    public string? SenderAddress { get; set; }
-    public string? Subject { get; set; }
-    public DateTime? EmailDate { get; set; }
-    public DateTime? ProcessedDate { get; set; }
-    public string? Status { get; set; }
-    public int? ErrorCodeValue { get; set; }
-    public string? ErrorMessage { get; set; }
-    public List<EmailAttachmentDto> Attachments { get; set; } = new();
-}
-
-public class EmailAttachmentDto
-{
-    public int Id { get; set; }
-    public string OriginalFileName { get; set; } = string.Empty;
-    public string FilePath { get; set; } = string.Empty;
-    public long FileSize { get; set; }
-    public bool IsEmbeddedFile { get; set; }
-    public string? Status { get; set; }
-    public string? ValidationErrorMessage { get; set; }
-}

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailAccountDto.cs

@@ -0,0 +1,17 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos;
+
+/// <summary>
+/// DTO for EmailAccount query results.
+/// </summary>
+public class EmailAccountDto
+{
+    public int Id { get; set; }
+    public string AccountName { get; set; } = string.Empty;
+    public string ImapServer { get; set; } = string.Empty;
+    public int ImapPort { get; set; }
+    public string SmtpServer { get; set; } = string.Empty;
+    public int SmtpPort { get; set; }
+    public string Username { get; set; } = string.Empty;
+    public bool UseOAuth2 { get; set; }
+    public bool IsActive { get; set; }
+}

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailAttachments/CreateEmailAttachmentDto.cs

@@ -0,0 +1,15 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailAttachments;
+
+/// <summary>
+/// DTO for creating EmailAttachment record.
+/// AutoMapper profile required: CreateEmailAttachmentDto -> EmailAttachment
+/// </summary>
+public record CreateEmailAttachmentDto(
+    int EmailHistoryId,
+    string OriginalFileName,
+    string SavedFileName,
+    string FilePath,
+    long FileSize,
+    string Extension,
+    string ContentType,
+    byte[] Content);

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailAttachments/EmailAttachmentDto.cs

@@ -0,0 +1,15 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailAttachments;
+
+/// <summary>
+/// DTO for EmailAttachment query results.
+/// </summary>
+public class EmailAttachmentDto
+{
+    public int Id { get; set; }
+    public string OriginalFileName { get; set; } = string.Empty;
+    public string FilePath { get; set; } = string.Empty;
+    public long FileSize { get; set; }
+    public bool IsEmbeddedFile { get; set; }
+    public string? Status { get; set; }
+    public string? ValidationErrorMessage { get; set; }
+}

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailAttachments/UpdateEmailAttachmentStatusDto.cs

@@ -0,0 +1,10 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailAttachments;
+
+/// <summary>
+/// DTO for updating EmailAttachment status.
+/// AutoMapper profile required: UpdateEmailAttachmentStatusDto -> EmailAttachment
+/// </summary>
+public record UpdateEmailAttachmentStatusDto(
+    string Status,
+    int? ValidationErrorCode = null,
+    string? ValidationErrorMessage = null);

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailHistories/CreateEmailHistoryDto.cs

@@ -0,0 +1,15 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailHistories;
+
+/// <summary>
+/// DTO for creating EmailHistory record.
+/// AutoMapper profile required: CreateEmailHistoryDto -> EmailHistory
+/// </summary>
+public record CreateEmailHistoryDto(
+    int ProfileId,
+    string MessageIdHash,
+    string OriginalMessageId,
+    string SenderAddress,
+    DateTime EmailDate,
+    string Subject,
+    string? EmailBodyText,
+    string? EmailBodyHtml);

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailHistories/EmailHistoryDto.cs

@@ -0,0 +1,21 @@
+using DigitalData.EmailProfiler.Application.Common.Dtos.EmailAttachments;
+
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailHistories;
+
+/// <summary>
+/// DTO for EmailHistory query results.
+/// </summary>
+public class EmailHistoryDto
+{
+    public int Id { get; set; }
+    public int? ProfileId { get; set; }
+    public string? ProfileName { get; set; }
+    public string? SenderAddress { get; set; }
+    public string? Subject { get; set; }
+    public DateTime? EmailDate { get; set; }
+    public DateTime? ProcessedDate { get; set; }
+    public string? Status { get; set; }
+    public int? ErrorCodeValue { get; set; }
+    public string? ErrorMessage { get; set; }
+    public List<EmailAttachmentDto> Attachments { get; set; } = new();
+}

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailHistories/UpdateEmailHistoryStatusDto.cs

@@ -0,0 +1,11 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos.EmailHistories;
+
+/// <summary>
+/// DTO for updating EmailHistory status.
+/// AutoMapper profile required: UpdateEmailHistoryStatusDto -> EmailHistory
+/// </summary>
+public record UpdateEmailHistoryStatusDto(
+    string Status,
+    DateTime? ProcessedDate = null,
+    int? ErrorCodeValue = null,
+    string? ErrorMessage = null);

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailProfileDto.cs

@@ -0,0 +1,18 @@
+namespace DigitalData.EmailProfiler.Application.Common.Dtos;
+
+/// <summary>
+/// DTO for EmailProfile query results.
+/// </summary>
+public class EmailProfileDto
+{
+    public int Id { get; set; }
+    public string ProfileName { get; set; } = string.Empty;
+    public int EmailAccountId { get; set; }
+    public string? EmailAccountName { get; set; }
+    public int? ProcessId { get; set; }
+    public string? ProcessName { get; set; }
+    public int PollIntervalMinutes { get; set; }
+    public DateTime? LastPollTime { get; set; }
+    public bool IsActive { get; set; }
+    public string? Comment { get; set; }
+}