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/note/note-service-dto.ts

@@ -0,0 +1,60 @@
+export type ServiceInputCreateNote = {
+  noteTypeId: number;
+  fields: string[];
+  tags?: string[];
+  userId: string;
+};
+
+export type ServiceInputUpdateNote = {
+  noteId: bigint;
+  fields?: string[];
+  tags?: string[];
+  userId: string;
+};
+
+export type ServiceInputDeleteNote = {
+  noteId: bigint;
+  userId: string;
+};
+
+export type ServiceInputGetNoteById = {
+  noteId: bigint;
+};
+
+export type ServiceInputGetNotesByNoteTypeId = {
+  noteTypeId: number;
+  limit?: number;
+  offset?: number;
+};
+
+export type ServiceInputGetNotesByUserId = {
+  userId: string;
+  limit?: number;
+  offset?: number;
+};
+
+export type ServiceOutputNote = {
+  id: bigint;
+  guid: string;
+  noteTypeId: number;
+  mod: number;
+  usn: number;
+  tags: string[];
+  fields: string[];
+  sfld: string;
+  csum: number;
+  flags: number;
+  data: string;
+  userId: string;
+  createdAt: Date;
+  updatedAt: Date;
+};
+
+export type ServiceOutputCreateNote = {
+  id: bigint;
+  guid: string;
+};
+
+export type ServiceOutputNoteCount = {
+  count: number;
+};