Add outline import feature; drop Dto naming, map entities at the API boundary

Services now return entities; endpoints (and the agent toolsets) map to
*Response records instead of services building wire DTOs themselves.
Also brings in the outline-import agent, MCP tool, ledger and web dialog
that were already in progress on disk.

src/Novelly.Api/Agent/NovelAgentService.cs

@@ -29,7 +29,7 @@ public class NovelAgentService(
 
     private readonly AgentOptions _options = options.Value;
 
-    public async Task<IReadOnlyList<ConversationSummaryDto>> ListConversationsAsync(
+    public async Task<IReadOnlyList<ConversationSummaryResponse>> ListConversationsAsync(
         Guid projectId, CancellationToken ct = default)
     {
         logger.LogInformation("Listing agent conversations for project {ProjectId}", projectId);
@@ -37,29 +37,18 @@ public class NovelAgentService(
         return await db.Conversations
             .Where(c => c.ProjectId == projectId)
             .OrderByDescending(c => c.UpdatedAt)
-            .Select(c => new ConversationSummaryDto(c.Id, c.ProjectId, c.Title, c.Messages.Count, c.UpdatedAt))
+            .Select(c => new ConversationSummaryResponse(c.Id, c.ProjectId, c.Title, c.Messages.Count, c.UpdatedAt))
             .ToListAsync(ct);
     }
 
     /// <summary>Null when no conversation has this id — a lookup miss is expected, not exceptional.</summary>
-    public async Task<ConversationDto?> GetConversationAsync(Guid conversationId, CancellationToken ct = default)
+    public async Task<AgentConversation?> GetConversationAsync(Guid conversationId, CancellationToken ct = default)
     {
         Guard.Default(conversationId, nameof(conversationId));
 
         logger.LogInformation("Getting agent conversation {ConversationId}", conversationId);
 
-        var conversation = await FindConversationAsync(conversationId, ct);
-        if (conversation is null)
-        {
-            return null;
-        }
-
-        return new ConversationDto(
-            conversation.Id,
-            conversation.ProjectId,
-            conversation.Title,
-            [.. conversation.Messages.OrderBy(m => m.Sequence).Select(ToDto)],
-            conversation.UpdatedAt);
+        return await FindConversationAsync(conversationId, ct);
     }
 
     /// <summary>True if a conversation was deleted; false if no conversation had this id.</summary>
@@ -84,7 +73,7 @@ public class NovelAgentService(
     /// Sends a message to the agent and runs it to completion, executing any tools it
     /// calls along the way. Returns the assistant's final turn.
     /// </summary>
-    public async Task<AgentTurnDto> SendMessageAsync(
+    public async Task<AgentMessage> SendMessageAsync(
         Guid projectId, SendAgentMessageRequest request, CancellationToken ct = default)
     {
         Guard.Default(projectId, nameof(projectId));
@@ -109,7 +98,7 @@ public class NovelAgentService(
 
         var systemPrompt = await BuildSystemPromptAsync(projectId, ct);
         var transcript = BuildTranscript(conversation);
-        var toolCalls = new List<ToolCallDto>();
+        var toolCalls = new List<ToolCallResponse>();
         var text = new StringBuilder();
 
         for (var iteration = 0; iteration < _options.MaxIterations; iteration++)
@@ -146,7 +135,7 @@ public class NovelAgentService(
                     "Agent tool {Tool} on project {ProjectId} {Outcome}",
                     call.Name, projectId, outcome.IsError ? "failed" : "succeeded");
 
-                toolCalls.Add(new ToolCallDto(call.Name, call.Input.ToString(), outcome.Content));
+                toolCalls.Add(new ToolCallResponse(call.Name, call.Input.ToString(), outcome.Content));
                 results.Add(new AgentToolResultBlock(call.Id, outcome.Content, outcome.IsError));
             }
 
@@ -170,7 +159,7 @@ public class NovelAgentService(
             toolCalls.Count > 0 ? JsonSerializer.Serialize(toolCalls, JsonOptions) : null,
             ct);
 
-        return new AgentTurnDto(conversation.Id, ToDto(reply));
+        return reply;
     }
 
     /// <summary>
@@ -307,15 +296,6 @@ public class NovelAgentService(
             """;
     }
 
-    private static AgentMessageDto ToDto(AgentMessage message) => new(
-        message.Id,
-        message.Role,
-        message.Content,
-        message.ToolCallsJson is null
-            ? []
-            : JsonSerializer.Deserialize<List<ToolCallDto>>(message.ToolCallsJson, JsonOptions) ?? [],
-        message.CreatedAt);
-
     /// <summary>Derives a conversation title from its opening message.</summary>
     private static string Summarise(string message)
     {