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.

tests/Novelly.Api.Tests/ListingTests.cs

@@ -84,9 +84,9 @@ public class ListingTests : ServiceTestFixture
         Assert.Multiple(() =>
         {
             Assert.That(listed.Select(c => c.Title), Is.EqualTo(new[] { "First", "Second" }));
-            Assert.That(listed.Single(c => c.Id == second.Id).SceneCount, Is.EqualTo(2));
-            Assert.That(listed.Single(c => c.Id == second.Id).WordCount, Is.EqualTo(3));
-            Assert.That(listed.Single(c => c.Id == first.Id).WordCount, Is.EqualTo(0));
+            Assert.That(listed.Single(c => c.Id == second.Id).Scenes, Has.Count.EqualTo(2));
+            Assert.That(listed.Single(c => c.Id == second.Id).Scenes.Sum(s => s.WordCount), Is.EqualTo(3));
+            Assert.That(listed.Single(c => c.Id == first.Id).Scenes.Sum(s => s.WordCount), Is.EqualTo(0));
         });
     }