feat: implement user and admin login flow

server/api/login/admin.post.ts

@@ -0,0 +1,21 @@
+import { defineEventHandler, readBody, setResponseStatus } from 'h3';
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody(event);
+  const { password } = body;
+
+  if (!password) {
+    setResponseStatus(event, 400);
+    return { message: '请填写密码' };
+  }
+
+  // TODO: Replace with a more secure admin authentication method
+  if (password === 'adminpassword') {
+    return {
+      message: '管理员登录成功！',
+    };
+  } else {
+    setResponseStatus(event, 401);
+    return { message: '密码错误' };
+  }
+});