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/Data/NovelDbContext.cs

@@ -4,6 +4,7 @@ using Novelly.Api.Agent;
 using Novelly.Api.Beats;
 using Novelly.Api.Chapters;
 using Novelly.Api.Characters;
+using Novelly.Api.Imports;
 using Novelly.Api.Projects;
 using Novelly.Api.Questions;
 using Novelly.Api.Scenes;
@@ -36,6 +37,7 @@ public class NovelDbContext(DbContextOptions<NovelDbContext> options)
     public DbSet<OpenQuestion> OpenQuestions => Set<OpenQuestion>();
     public DbSet<AgentConversation> Conversations => Set<AgentConversation>();
     public DbSet<AgentMessage> AgentMessages => Set<AgentMessage>();
+    public DbSet<ImportJob> ImportJobs => Set<ImportJob>();
 
     Task<int> INovelDbContext.SaveChangesAsync(CancellationToken cancellationToken) =>
         base.SaveChangesAsync(cancellationToken);
@@ -183,5 +185,15 @@ public class NovelDbContext(DbContextOptions<NovelDbContext> options)
             entity.Property(m => m.Role).HasConversion<string>().HasMaxLength(16);
             entity.HasIndex(m => new { m.ConversationId, m.Sequence }).IsUnique();
         });
+
+        builder.Entity<ImportJob>(entity =>
+        {
+            entity.Property(j => j.SourceRoot).IsRequired().HasMaxLength(1000);
+            entity.Property(j => j.Status).HasConversion<string>().HasMaxLength(16);
+
+            // No FK to Project: a job outlives the project it created, including the
+            // force-restart path where that project is deleted out from under it.
+            entity.HasIndex(j => j.SourceRoot);
+        });
     }
 }