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/Chapters/ChapterService.cs

@@ -14,13 +14,13 @@ public class ChapterService(
     IModelValidator<CreateChapterRequest> createValidator,
     IModelValidator<UpdateChapterRequest> updateValidator)
 {
-    public async Task<IReadOnlyList<ChapterSummaryDto>> ListAsync(Guid projectId, CancellationToken ct = default)
+    public async Task<IReadOnlyList<Chapter>> ListAsync(Guid projectId, CancellationToken ct = default)
     {
         Guard.Default(projectId, nameof(projectId));
 
         logger.LogInformation("Listing chapters for project {ProjectId}", projectId);
 
-        var chapters = await db.Chapters
+        return await db.Chapters
             .Include(c => c.PovCharacter)
             .Include(c => c.Beats)
             .Include(c => c.Scenes)
@@ -28,20 +28,18 @@ public class ChapterService(
             .Where(c => c.ProjectId == projectId)
             .OrderBy(c => c.Number)
             .ToListAsync(ct);
-
-        return [.. chapters.Select(c => c.ToSummaryDto())];
     }
 
     /// <summary>Null when no chapter has this id — a lookup miss is expected, not exceptional.</summary>
-    public async Task<ChapterDto?> GetAsync(Guid id, CancellationToken ct = default)
+    public async Task<Chapter?> GetAsync(Guid id, CancellationToken ct = default)
     {
         Guard.Default(id, nameof(id));
 
         logger.LogInformation("Getting chapter {ChapterId}", id);
-        return (await FindAsync(id, ct))?.ToDto();
+        return await FindAsync(id, ct);
     }
 
-    public async Task<ChapterDto> CreateAsync(Guid projectId, CreateChapterRequest request, CancellationToken ct = default)
+    public async Task<Chapter> CreateAsync(Guid projectId, CreateChapterRequest request, CancellationToken ct = default)
     {
         Guard.Default(projectId, nameof(projectId));
         Guard.Null(request, nameof(request));
@@ -77,10 +75,10 @@ public class ChapterService(
         await db.SaveChangesAsync(ct);
 
         // Just created it — the reload is only to pick up includes, not to check existence.
-        return (await FindAsync(chapter.Id, ct))!.ToDto();
+        return (await FindAsync(chapter.Id, ct))!;
     }
 
-    public async Task<ChapterDto?> UpdateAsync(Guid id, UpdateChapterRequest request, CancellationToken ct = default)
+    public async Task<Chapter?> UpdateAsync(Guid id, UpdateChapterRequest request, CancellationToken ct = default)
     {
         Guard.Default(id, nameof(id));
         Guard.Null(request, nameof(request));
@@ -110,7 +108,7 @@ public class ChapterService(
         }
 
         await db.SaveChangesAsync(ct);
-        return (await FindAsync(id, ct))!.ToDto();
+        return (await FindAsync(id, ct))!;
     }
 
     /// <summary>True if a chapter was deleted; false if no chapter had this id.</summary>