feat: 添加分类统计功能，支持获取月度和年度预算统计信息

WebApi/Controllers/BudgetController.cs

@@ -15,7 +15,14 @@ public class BudgetController(
     {
         try
         {
-            return (await budgetService.GetListAsync(referenceDate)).Ok();
+            return (await budgetService.GetListAsync(referenceDate))
+                .OrderBy(b => b.IsStopped)
+                .OrderBy(b => b.Category)
+                .ThenBy(b => b.Type)
+                .ThenByDescending(b => b.Current / b.Limit)
+                .ThenBy(b => b.Name)
+                .ToList()
+                .Ok();
         }
         catch (Exception ex)
         {
@@ -48,6 +55,24 @@ public class BudgetController(
         }
     }
 
+    /// <summary>
+    /// 获取分类统计信息（月度和年度）
+    /// </summary>
+    [HttpGet]
+    public async Task<BaseResponse<BudgetCategoryStats>> GetCategoryStatsAsync([FromQuery] BudgetCategory category, [FromQuery] DateTime? referenceDate = null)
+    {
+        try
+        {
+            var result = await budgetService.GetCategoryStatsAsync(category, referenceDate);
+            return result.Ok();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "获取分类统计失败, Category: {Category}", category);
+            return $"获取分类统计失败: {ex.Message}".Fail<BudgetCategoryStats>();
+        }
+    }
+
     /// <summary>
     /// 删除预算
     /// </summary>