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/.
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