feat(M-PALACE): create complete palace-game module structure
- Data layer: palace-db.json, persona-dict.json, world templates (古代中国 + 架空王朝)
- Backend engines: persona-analyzer, background-gen, plot-engine, save-manager
- Backend routes: start.js, interact.js, save.js
- Backend server: Express on port 3003
- Frontend: index.html, game.html, save.html, game.js, save.js, style.css
- .gitignore: exclude save data files
Co-authored-by: qinfendebingshuo <207279273+qinfendebingshuo@users.noreply.github.com>
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