feat: 完成用户登录界面，api还需完善

server/api/user/needRegister.ts

@@ -0,0 +1,16 @@
+// import bcrypt from 'bcryptjs';
+import BetterSqlite3 from 'better-sqlite3';
+
+export default defineEventHandler(async (event) => {
+    // const body = await readBody(event);
+    const userDB = BetterSqlite3('./userData/db/user.db');
+
+    // 临时使用，若表中已有用户，则拒绝创建新的用户
+    const existingUser = userDB.prepare('SELECT * FROM user').get();
+    userDB.close();
+    if (existingUser) {
+        return true
+    } else {
+        return false
+    }
+});