Rename Project concept to Novel across the stack

Renames the domain concept from Project to Novel throughout the backend
(entities, DTOs, services, endpoints, ProjectAccessService/Permission,
ProjectId foreign keys), MCP server (tool names and routes), and the
React/Vite frontend (types, hooks, routes, components). Adds a new EF
Core migration (RenameProjectToNovel) using RenameTable/RenameColumn to
preserve existing data instead of dropping/recreating tables. Updates
CLAUDE.md's structure section to reference Novels/ instead of Projects/.

src/Novelly.Api/Imports/ImportService.cs

@@ -3,14 +3,14 @@ using Microsoft.EntityFrameworkCore;
 using Novelly.Api.Common;
 using Novelly.Api.Common.Validation;
 using Novelly.Api.Data;
-using Novelly.Api.Projects;
+using Novelly.Api.Novels;
 using Novelly.Api.Users;
 
 namespace Novelly.Api.Imports;
 
 public class ImportService(
     INovelDbContext db,
-    ProjectService projects,
+    NovelService novels,
     Channel<Guid> queue,
     INovelUserContext userContext,
     ILogger<ImportService> logger,
@@ -37,7 +37,7 @@ public class ImportService(
         var readiness = ImportPaths.IsComplete(ledger, total) ? ImportReadiness.Complete : ImportReadiness.Resumable;
 
         return Task.FromResult(new ImportInspectionResponse(
-            readiness, ledger.ProjectId, chaptersDone, total, ledger.CompletedPasses ?? []));
+            readiness, ledger.NovelId, chaptersDone, total, ledger.CompletedPasses ?? []));
     }
 
     public async Task<ImportJob> StartOrResumeAsync(StartImportRequest request, CancellationToken ct = default)
@@ -53,11 +53,11 @@ public class ImportService(
         if (request.ForceRestart)
         {
             var ledger = ImportPaths.ReadLedger(root);
-            if (ledger?.ProjectId is { } existingProjectId)
+            if (ledger?.NovelId is { } existingNovelId)
             {
                 logger.LogWarning(
-                    "Force-restarting import for {SourceRoot}: deleting project {ProjectId}", root, existingProjectId);
-                await projects.DeleteAsync(existingProjectId, ct);
+                    "Force-restarting import for {SourceRoot}: deleting novel {NovelId}", root, existingNovelId);
+                await novels.DeleteAsync(existingNovelId, ct);
             }
 
             ImportPaths.DeleteLedger(root);