feat: 后端添加获取空闲实验板，继续修改前端界面使其更加合理

server/src/Controllers/DataController.cs

@@ -1,5 +1,4 @@
 using System.IdentityModel.Tokens.Jwt;
-using System.Net;
 using System.Security.Claims;
 using System.Text;
 using Microsoft.AspNetCore.Authorization;
@@ -192,6 +191,45 @@ public class DataController : ControllerBase
         }
     }
 
+    /// <summary>
+    /// 获取一个空闲的实验板（普通用户权限）
+    /// </summary>
+    [Authorize]
+    [HttpGet("GetAvailableBoard")]
+    [EnableCors("Users")]
+    [ProducesResponseType(typeof(Database.Board), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
+    public IActionResult GetAvailableBoard()
+    {
+        try
+        {
+            using var db = new Database.AppDataConnection();
+            var boardOpt = db.GetAvailableBoard();
+            if (!boardOpt.HasValue)
+                return NotFound("没有可用的实验板");
+
+            // 绑定用户与实验板
+            var userName = User.Identity?.Name;
+            if (string.IsNullOrEmpty(userName))
+                return Unauthorized("未找到用户名信息");
+
+            var userRet = db.GetUserByName(userName);
+            if (!userRet.IsSuccessful || !userRet.Value.HasValue)
+                return BadRequest("用户不存在");
+
+            var user = userRet.Value.Value;
+            db.BindUserToBoard(user.ID, boardOpt.Value.ID);
+
+            return Ok(boardOpt.Value);
+        }
+        catch (Exception ex)
+        {
+            logger.Error(ex, "获取空闲实验板时发生异常");
+            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
+        }
+    }
+
     /// <summary>
     /// 新增板子（管理员权限）
     /// </summary>