feat: 添加获取未被预算覆盖的分类统计信息接口；更新前端以展示未覆盖分类的详细信息

WebApi/Controllers/BudgetController.cs

@@ -78,6 +78,24 @@ public class BudgetController(
         }
     }
 
+    /// <summary>
+    /// 获取未被预算覆盖的分类统计信息
+    /// </summary>
+    [HttpGet]
+    public async Task<BaseResponse<List<UncoveredCategoryDetail>>> GetUncoveredCategoriesAsync([FromQuery] BudgetCategory category, [FromQuery] DateTime? referenceDate = null)
+    {
+        try
+        {
+            var result = await budgetService.GetUncoveredCategoriesAsync(category, referenceDate);
+            return result.Ok();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "获取未覆盖分类统计失败, Category: {Category}", category);
+            return $"获取未覆盖分类统计失败: {ex.Message}".Fail<List<UncoveredCategoryDetail>>();
+        }
+    }
+
     /// <summary>
     /// 删除预算
     /// </summary>