2481c8fce6
新增文件: - data/local/collections/ 3 个 Isar Collection 定义 + 生成 Schema - data/repositories/isar_journal_repository.dart 完整 CRUD + 乐观锁 修改文件: - app.dart: IsarJournalRepository 注册为主 JournalRepository + SyncEngine 注入 - editor_page.dart: onSave 接入 JournalRepository，笔画/元素自动保存到 Isar - sync_engine.dart: 新增 persistPendingQueue/restorePendingQueue Isar 持久化 - isar_database.dart: 注册 3 个 Collection Schema - main.dart: 启动时初始化 Isar 架构: 离线优先 — Isar 为本地主仓库，Remote 供 SyncEngine 推送
nuanji_app
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