add: 添加前端对焦交互逻辑

server/src/Controllers/VideoStreamController.cs

@@ -447,4 +447,61 @@ public class VideoStreamController : ControllerBase
             return TypedResults.InternalServerError($"执行自动对焦失败: {ex.Message}");
         }
     }
+
+    /// <summary>
+    /// 执行一次自动对焦 (GET方式)
+    /// </summary>
+    /// <returns>对焦结果</returns>
+    [HttpGet("Focus")]
+    [EnableCors("Users")]
+    [ProducesResponseType(typeof(object), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(object), StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(typeof(string), StatusCodes.Status500InternalServerError)]
+    public async Task<IResult> Focus()
+    {
+        try
+        {
+            logger.Info("收到执行一次对焦请求 (GET)");
+
+            // 检查摄像头是否已配置
+            if (!_videoStreamService.IsCameraConfigured())
+            {
+                logger.Warn("摄像头未配置，无法执行对焦");
+                return TypedResults.BadRequest(new
+                {
+                    success = false,
+                    message = "摄像头未配置，请先配置摄像头连接",
+                    timestamp = DateTime.Now
+                });
+            }
+
+            var result = await _videoStreamService.PerformAutoFocusAsync();
+            
+            if (result)
+            {
+                logger.Info("对焦执行成功");
+                return TypedResults.Ok(new
+                {
+                    success = true,
+                    message = "对焦执行成功",
+                    timestamp = DateTime.Now
+                });
+            }
+            else
+            {
+                logger.Warn("对焦执行失败");
+                return TypedResults.BadRequest(new
+                {
+                    success = false,
+                    message = "对焦执行失败",
+                    timestamp = DateTime.Now
+                });
+            }
+        }
+        catch (Exception ex)
+        {
+            logger.Error(ex, "执行对焦时发生异常");
+            return TypedResults.InternalServerError($"执行对焦失败: {ex.Message}");
+        }
+    }
 }