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.Mcp/Tools/QuestionTools.cs

@@ -13,7 +13,7 @@ public static class QuestionTools
                  + "thinking, not a gap to fill in for them.")]
     public static Task<CallToolResult> ListOpenQuestions(
         NovelApiClient api,
-        [Description("The project's id.")] Guid projectId,
+        [Description("The novel's id.")] Guid novelId,
         CancellationToken ct,
         [Description("Narrow to questions about one chapter outline.")] Guid? chapterId = null,
         [Description("Narrow to questions about one character.")] Guid? characterId = null,
@@ -31,7 +31,7 @@ public static class QuestionTools
             query.Add($"characterId={character}");
         }
 
-        return api.GetAsync($"/api/projects/{projectId}/questions?{string.Join('&', query)}", ct);
+        return api.GetAsync($"/api/novels/{novelId}/questions?{string.Join('&', query)}", ct);
     }
 
     [McpServerTool(Name = "raise_open_question")]
@@ -39,13 +39,13 @@ public static class QuestionTools
                  + "and/or the character it is about. Prefer raising a question over guessing.")]
     public static Task<CallToolResult> RaiseOpenQuestion(
         NovelApiClient api,
-        [Description("The project's id.")] Guid projectId,
+        [Description("The novel's id.")] Guid novelId,
         [Description("The question, in one line.")] string question,
         CancellationToken ct,
         [Description("The thinking around it — options considered, and what each costs.")] string? detail = null,
         [Description("Id of the chapter outline this is about, if any.")] Guid? chapterId = null,
         [Description("Id of the character this is about, if any.")] Guid? characterId = null) =>
-        api.PostAsync($"/api/projects/{projectId}/questions",
+        api.PostAsync($"/api/novels/{novelId}/questions",
             new { question, detail, chapterId, characterId }, ct);
 
     [McpServerTool(Name = "update_open_question")]