refactor: 完全重构为 Anki 兼容数据结构

- 用 Deck 替换 Folder
- 用 Note + Card 替换 Pair (双向复习)
- 添加 NoteType (卡片模板)
- 添加 Revlog (复习历史)
- 实现 SM-2 间隔重复算法
- 更新所有前端页面
- 添加数据库迁移

src/modules/ocr/ocr-repository.ts

@@ -1,5 +1 @@
-import { repoCreatePair, repoGetUserIdByFolderId } from "@/modules/folder/folder-repository";
-import type { RepoInputCreatePair } from "./ocr-repository-dto";
-
-export { repoCreatePair, repoGetUserIdByFolderId };
-export type { RepoInputCreatePair };
+export {};