Novel Agent Demo v0.1.0

Demo release package for the Git-native AI novel writing workbench.\n\nIncludes source code, Dify DSL YAML snapshots, frontend/backend code, screenshots, and Windows start scripts.\n\nQuick start:\n\n\\powershell\n.\start_demo.ps1 -InitEnv\n# Fill deploy/demo/.env with Dify App keys and model provider keys\n.\start_demo.ps1\n\\n\nThis release does not include Dify database backups, model API keys, Dify App API keys, private books, or runtime storage.