重构项目结构，移除Assignment相关功能，优化Submission模块

TechHelper.Server/Controllers/SubjectController.cs

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+using Entities.Contracts;
+using Entities.DTO;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using System.Diagnostics;
+using System.Net;
+using System.Security.Claims;
+using TechHelper.Services.Beta;
+using TechHelper.Services;
+
+namespace TechHelper.Server.Controllers
+{
+    /// <summary>
+    /// 科目管理控制器
+    /// 处理科目相关的操作，如创建、更新、删除科目等
+    /// </summary>
+    [Route("api/subject")]
+    [ApiController]
+    public class SubjectController : ControllerBase
+    {
+        private readonly ISubjectService _subjectService;
+        private readonly UserManager<User> _userManager;
+
+        /// <summary>
+        /// 初始化科目控制器
+        /// </summary>
+        /// <param name="subjectService">科目服务</param>
+        /// <param name="userManager">用户管理服务</param>
+        public SubjectController(ISubjectService subjectService, UserManager<User> userManager)
+        {
+            _subjectService = subjectService;
+            _userManager = userManager;
+        }
+
+        #region 科目基本信息CRUD操作
+
+        /// <summary>
+        /// 获取科目列表（支持搜索）
+        /// </summary>
+        /// <param name="query">查询参数</param>
+        /// <returns>科目列表</returns>
+        /// <response code="200">成功获取科目列表</response>
+        /// <response code="400">获取失败</response>
+        [HttpGet]
+        [Authorize(Roles = "Teacher,Admin")]
+        public async Task<IActionResult> GetAll([FromQuery] QueryParameter query)
+        {
+            var result = await _subjectService.GetAllAsync(query);
+            
+            if (!result.Status)
+            {
+                return BadRequest(result.Message);
+            }
+
+            return Ok(result.Result);
+        }
+
+        /// <summary>
+        /// 根据ID获取科目详细信息
+        /// </summary>
+        /// <param name="id">科目ID</param>
+        /// <returns>科目详细信息</returns>
+        /// <response code="200">成功获取科目信息</response>
+        /// <response code="400">科目未找到或获取失败</response>
+        [HttpGet("{id}")]
+        [Authorize(Roles = "Teacher,Admin")]
+        public async Task<IActionResult> GetById(Guid id)
+        {
+            var result = await _subjectService.GetAsync(id);
+            
+            if (!result.Status)
+            {
+                return BadRequest(result.Message);
+            }
+
+            return Ok(result.Result);
+        }
+
+        /// <summary>
+        /// 创建新科目
+        /// </summary>
+        /// <param name="model">科目数据传输对象</param>
+        /// <returns>创建结果</returns>
+        /// <response code="200">创建成功</response>
+        /// <response code="400">创建失败</response>
+        [HttpPost]
+        [Authorize(Roles = "Admin,Teacher")]
+        public async Task<IActionResult> Create([FromBody] SubjectDto model)
+        {
+            var result = await _subjectService.AddAsync(model);
+            
+            if (!result.Status)
+            {
+                return BadRequest(result.Message);
+            }
+
+            return Ok(result.Result);
+        }
+
+        /// <summary>
+        /// 更新科目信息
+        /// </summary>
+        /// <param name="model">科目数据传输对象</param>
+        /// <returns>更新结果</returns>
+        /// <response code="200">更新成功</response>
+        /// <response code="400">更新失败</response>
+        [HttpPut]
+        [Authorize(Roles = "Admin")]
+        public async Task<IActionResult> Update([FromBody] SubjectDto model)
+        {
+            var result = await _subjectService.UpdateAsync(model);
+            
+            if (!result.Status)
+            {
+                return BadRequest(result.Message);
+            }
+
+            return Ok(result.Result);
+        }
+
+        /// <summary>
+        /// 删除科目
+        /// </summary>
+        /// <param name="id">科目ID</param>
+        /// <returns>删除结果</returns>
+        /// <response code="200">删除成功</response>
+        /// <response code="400">删除失败</response>
+        [HttpDelete("{id}")]
+        [Authorize(Roles = "Admin")]
+        public async Task<IActionResult> Delete(Guid id)
+        {
+            var result = await _subjectService.DeleteAsync(id);
+            
+            if (!result.Status)
+            {
+                return BadRequest(result.Message);
+            }
+
+            return Ok(result.Message);
+        }
+
+        #endregion
+    }
+}