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/Projects/ProjectService.cs

@@ -11,13 +11,13 @@ public class ProjectService(
     IModelValidator<CreateProjectRequest> createValidator,
     IModelValidator<UpdateProjectRequest> updateValidator)
 {
-    public async Task<IReadOnlyList<ProjectSummaryDto>> ListAsync(CancellationToken ct = default)
+    public async Task<IReadOnlyList<ProjectSummaryResponse>> ListAsync(CancellationToken ct = default)
     {
         logger.LogInformation("Listing projects");
 
         return await db.Projects
             .OrderByDescending(p => p.UpdatedAt)
-            .Select(p => new ProjectSummaryDto(
+            .Select(p => new ProjectSummaryResponse(
                 p.Id,
                 p.Title,
                 p.Author,
@@ -32,15 +32,15 @@ public class ProjectService(
     }
 
     /// <summary>Null when no project has this id — a lookup miss is expected, not exceptional.</summary>
-    public async Task<ProjectDto?> GetAsync(Guid id, CancellationToken ct = default)
+    public async Task<Project?> GetAsync(Guid id, CancellationToken ct = default)
     {
         Guard.Default(id, nameof(id));
 
         logger.LogInformation("Getting project {ProjectId}", id);
-        return (await FindAsync(id, ct))?.ToDto();
+        return await FindAsync(id, ct);
     }
 
-    public async Task<ProjectDto> CreateAsync(CreateProjectRequest request, CancellationToken ct = default)
+    public async Task<Project> CreateAsync(CreateProjectRequest request, CancellationToken ct = default)
     {
         Guard.Null(request, nameof(request));
         createValidator.Validate(request).ThrowIfInvalid();
@@ -60,10 +60,10 @@ public class ProjectService(
 
         db.Projects.Add(project);
         await db.SaveChangesAsync(ct);
-        return project.ToDto();
+        return project;
     }
 
-    public async Task<ProjectDto?> UpdateAsync(Guid id, UpdateProjectRequest request, CancellationToken ct = default)
+    public async Task<Project?> UpdateAsync(Guid id, UpdateProjectRequest request, CancellationToken ct = default)
     {
         Guard.Default(id, nameof(id));
         Guard.Null(request, nameof(request));
@@ -87,7 +87,7 @@ public class ProjectService(
         project.UpdatedAt = DateTimeOffset.UtcNow;
 
         await db.SaveChangesAsync(ct);
-        return project.ToDto();
+        return project;
     }
 
     /// <summary>True if a project was deleted; false if no project had this id.</summary>