refactor: 删除未使用的用户管理相关代码

- 移除 user-management 组件
- 删除 Problem 和 User 相关类型定义
- 清理不再需要的配置文件引用

src/features/user-management/index.tsx

@@ -1,49 +0,0 @@
-"use client"
-
-import { UserTable } from "./components/user-table"
-import { adminConfig } from "./config/admin"
-import { teacherConfig } from "./config/teacher"
-import { guestConfig } from "./config/guest"
-import { problemConfig } from "./config/problem"
-
-interface UserManagementProps {
-  userType: "admin" | "teacher" | "guest" | "problem"
-}
-
-export function UserManagement({ userType }: UserManagementProps) {
-  // 根据用户类型返回对应的配置
-  if (userType === "admin") {
-    return (
-      <UserTable
-        config={adminConfig}
-        data={[]}
-      />
-    )
-  }
-  if (userType === "teacher") {
-    return (
-      <UserTable
-        config={teacherConfig}
-        data={[]}
-      />
-    )
-  }
-  if (userType === "guest") {
-    return (
-      <UserTable
-        config={guestConfig}
-        data={[]}
-      />
-    )
-  }
-  if (userType === "problem") {
-    return (
-      <UserTable
-        config={problemConfig}
-        data={[]}
-      />
-    )
-  }
-  
-  return <div>暂不支持 {userType} 类型</div>
-} 

src/types/problem.ts

@@ -1,12 +0,0 @@
-export interface Problem {
-  id: string;
-  displayId: number;
-  difficulty: string;
-  isPublished: boolean;
-  isTrim: boolean;
-  timeLimit: number;
-  memoryLimit: number;
-  userId?: string | null;
-  createdAt: string;
-  updatedAt: string;
-} 

src/types/user.ts

@@ -1,19 +0,0 @@
-export interface UserBase {
-  id: string;
-  name?: string;
-  email: string;
-  password?: string;
-  role?: string;
-  createdAt: string;
-  updatedAt?: string;
-}
-
-export interface Admin extends UserBase {
-  // 管理员特有字段（如有）
-}
-export interface Teacher extends UserBase {
-  // 教师特有字段（如有）
-}
-export interface Guest extends UserBase {
-  // 学生特有字段（如有）
-}