feat: add register page and logout button

src/app/api/register/route.ts

@@ -0,0 +1,49 @@
+/* eslint-disable no-console */
+import { NextRequest, NextResponse } from 'next/server';
+
+import { db } from '@/lib/db';
+
+export const runtime = 'edge';
+
+// 读取存储类型环境变量，默认 localstorage
+const STORAGE_TYPE =
+  (process.env.NEXT_PUBLIC_STORAGE_TYPE as string | undefined) ||
+  'localstorage';
+
+export async function POST(req: NextRequest) {
+  try {
+    // localstorage 模式下不支持注册
+    if (STORAGE_TYPE === 'localstorage') {
+      return NextResponse.json(
+        { error: '当前模式不支持注册' },
+        { status: 400 }
+      );
+    }
+
+    const { username, password } = await req.json();
+
+    if (!username || typeof username !== 'string') {
+      return NextResponse.json({ error: '用户名不能为空' }, { status: 400 });
+    }
+    if (!password || typeof password !== 'string') {
+      return NextResponse.json({ error: '密码不能为空' }, { status: 400 });
+    }
+
+    try {
+      // 检查用户是否已存在
+      const exist = await db.checkUserExist(username);
+      if (exist) {
+        return NextResponse.json({ error: '用户已存在' }, { status: 400 });
+      }
+
+      await db.registerUser(username, password);
+      return NextResponse.json({ ok: true });
+    } catch (err) {
+      console.error('数据库注册失败', err);
+      return NextResponse.json({ error: '数据库错误' }, { status: 500 });
+    }
+  } catch (error) {
+    console.error('注册接口异常', error);
+    return NextResponse.json({ error: '服务器错误' }, { status: 500 });
+  }
+}