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/app/decks/[deck_id]/page.tsx

@@ -0,0 +1,37 @@
+import { redirect } from "next/navigation";
+import { getTranslations } from "next-intl/server";
+import { InDeck } from "./InDeck";
+import { auth } from "@/auth";
+import { headers } from "next/headers";
+import { actionGetDeckById } from "@/modules/deck/deck-action";
+
+export default async function DecksPage({
+  params,
+}: {
+  params: Promise<{ deck_id: number; }>;
+}) {
+  const session = await auth.api.getSession({ headers: await headers() });
+  const { deck_id } = await params;
+  const t = await getTranslations("deck_id");
+
+  if (!deck_id) {
+    redirect("/decks");
+  }
+
+  const deckInfo = (await actionGetDeckById({ deckId: Number(deck_id) })).data;
+
+  if (!deckInfo) {
+    redirect("/decks");
+  }
+
+  const isOwner = session?.user?.id === deckInfo.userId;
+  const isPublic = deckInfo.visibility === "PUBLIC";
+
+  if (!isOwner && !isPublic) {
+    redirect("/decks");
+  }
+
+  const isReadOnly = !isOwner;
+
+  return <InDeck deckId={Number(deck_id)} isReadOnly={isReadOnly} />;
+}