An activity interface

src/Yavsc.Abstract/Workflow/ActivityBrowseItemDto.cs

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+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Activity node returned by the browsing API.
+/// </summary>
+public sealed class ActivityBrowseItemDto
+{
+    public string Code { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public string ParentCode { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public string Photo { get; set; } = string.Empty;
+    public int Rate { get; set; }
+    public int PerformerCount { get; set; }
+    public List<CommandFormSummaryDto> Forms { get; set; } = new();
+    public List<ActivityBrowseItemDto> Children { get; set; } = new();
+}

src/Yavsc.Abstract/Workflow/ActivityPerformerDto.cs

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+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Lightweight performer description returned for one activity.
+/// </summary>
+public sealed class ActivityPerformerDto
+{
+    public string PerformerId { get; set; } = string.Empty;
+    public string UserName { get; set; } = string.Empty;
+    public bool Active { get; set; }
+    public bool AcceptNotifications { get; set; }
+    public bool AcceptPublicContact { get; set; }
+    public string WebSite { get; set; } = string.Empty;
+    public string ActivityCode { get; set; } = string.Empty;
+    public string ActivityName { get; set; } = string.Empty;
+    public string SettingsClassName { get; set; } = string.Empty;
+    public int ExtraActivityCount { get; set; }
+}

src/Yavsc.Abstract/Workflow/CommandFormSummaryDto.cs

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+namespace Yavsc.Abstract.Workflow;
+
+/// <summary>
+/// Lightweight command-form description exposed to API clients.
+/// </summary>
+public sealed class CommandFormSummaryDto
+{
+    public long Id { get; set; }
+    public string ActionName { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+}