feat: 更新预算服务和控制器，优化统计信息获取逻辑，增强参数验证

WebApi/Controllers/BudgetController.cs

@@ -35,10 +35,16 @@ public class BudgetController(
     /// 获取单个预算统计信息
     /// </summary>
     [HttpGet]
-    public async Task<BaseResponse<BudgetResult>> GetStatisticsAsync([FromQuery] long id, [FromQuery] DateTime? referenceDate = null)
+    public async Task<BaseResponse<BudgetResult>> GetStatisticsAsync([FromQuery] long id, [FromQuery] DateTime referenceDate)
     {
         try
         {
+            // 参数验证
+            if (id == 0)
+            {
+                return "预算 Id 无效".Fail<BudgetResult>();
+            }
+
             var result = await budgetService.GetStatisticsAsync(id, referenceDate);
 
             if (result == null)
@@ -204,11 +210,11 @@ public class BudgetController(
         {
             var msg = await budgetService.ArchiveBudgetsAsync(year, month);
 
-            if(!string.IsNullOrEmpty(msg))
+            if (!string.IsNullOrEmpty(msg))
             {
                 return msg.Fail();
             }
-            
+
             return BaseResponse.Done();
         }
         catch (Exception ex)