feat: 移除预算同步相关功能，简化预算管理逻辑

WebApi/Controllers/BudgetController.cs

@@ -68,8 +68,7 @@ public class BudgetController(
                 Limit = dto.Limit,
                 Category = dto.Category,
                 SelectedCategories = dto.SelectedCategories != null ? string.Join(",", dto.SelectedCategories) : string.Empty,
-                StartDate = dto.StartDate ?? DateTime.Now,
-                LastSync = DateTime.Now
+                StartDate = dto.StartDate ?? DateTime.Now
             };
 
             var success = await budgetService.AddAsync(budget);
@@ -122,30 +121,4 @@ public class BudgetController(
         }
     }
 
-    /// <summary>
-    /// 同步预算数据
-    /// </summary>
-    [HttpPost]
-    public async Task<BaseResponse<BudgetDto>> SyncAsync([FromQuery] long id, [FromQuery] DateTime? referenceDate = null)
-    {
-        try
-        {
-            var budget = await budgetService.GetByIdAsync(id);
-            if (budget == null)
-            {
-                return "预算不存在".Fail<BudgetDto>();
-            }
-
-            budget.LastSync = DateTime.Now;
-            await budgetService.UpdateAsync(budget);
-
-            var currentAmount = await budgetService.CalculateCurrentAmountAsync(budget, referenceDate);
-            return BudgetDto.FromEntity(budget, currentAmount, referenceDate).Ok();
-        }
-        catch (Exception ex)
-        {
-            logger.LogError(ex, "同步预算失败, Id: {Id}", id);
-            return $"同步失败: {ex.Message}".Fail<BudgetDto>();
-        }
-    }
 }