迭代 ONE-OS 多原型：合同模板重构与租赁合同列表/表单增强

- 合同模板管理：模板数据层、章节编辑与品牌车型选择器
- 租赁合同管理：列表子表、交车安排、里程汇总及新建/编辑表单优化
- 同步各原型 annotation-source 与 PRD；新增项目导航同步脚本

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -9,6 +9,7 @@
     "dev": "node scripts/sync-vendor-if-present.mjs && vite",
     "start": "npm run dev",
     "metadata:sync": "node scripts/sync-project-metadata.mjs",
+    "project-nav:sync": "node scripts/sync-project-prototype-directory.mjs",
     "oneos-web:sync": "node scripts/sync-oneos-web-prototypes.mjs && node scripts/scan-entries.js && npm run metadata:sync",
     "build": "node scripts/sync-vendor-if-present.mjs && node scripts/scan-entries.js && node scripts/build-all.js",
     "preview": "vite preview",