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.

README.md

@@ -204,6 +204,15 @@ dotnet publish src/Novelly.Mcp -c Release -o ./mcp-server
 The API must be running. If it is not, the tools say so in a message the model can act on
 rather than failing opaquely.
 
+### Importing an existing outline
+
+`.claude/agents/outline-importer.md` is a Claude Code subagent that reads an author's outline
+already on disk — chapter files and character dossiers in the folder shape described in that
+file — and writes it into a new Novelly project over the MCP server above. It's read-only against
+the source files and keeps a resumable ledger (`.novelly-import.json`) next to them, since a full
+book is more tool calls than fit in one turn. Invoke it with the source folder path once the API is
+running and `.mcp.json` is set up.
+
 ## API surface
 
 `GET /api/health`, plus: