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/ProjectDataTests.cs

@@ -144,7 +144,7 @@ public class ProjectDataTests : ServiceTestFixture
         Assert.Multiple(() =>
         {
             Assert.That(updated.Relationships, Has.Count.EqualTo(1));
-            Assert.That(updated.Relationships[0].RelatedCharacterName, Is.EqualTo("Mara"));
+            Assert.That(updated.Relationships[0].RelatedCharacter!.Name, Is.EqualTo("Mara"));
         });
     }