重构预算管理模块，添加预算记录和服务，更新相关API，优化预算统计逻辑

WebApi/Controllers/BudgetController.cs

@@ -0,0 +1,151 @@
+namespace WebApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]/[action]")]
+public class BudgetController(
+    IBudgetService budgetService,
+    ILogger<BudgetController> logger) : ControllerBase
+{
+    /// <summary>
+    /// 获取预算列表
+    /// </summary>
+    [HttpGet]
+    public async Task<BaseResponse<List<BudgetDto>>> GetListAsync([FromQuery] DateTime? referenceDate = null)
+    {
+        try
+        {
+            var budgets = await budgetService.GetAllAsync();
+            var dtos = new List<BudgetDto>();
+            
+            foreach (var budget in budgets)
+            {
+                var currentAmount = await budgetService.CalculateCurrentAmountAsync(budget, referenceDate);
+                dtos.Add(BudgetDto.FromEntity(budget, currentAmount, referenceDate));
+            }
+
+            return dtos.Ok();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "获取预算列表失败");
+            return $"获取预算列表失败: {ex.Message}".Fail<List<BudgetDto>>();
+        }
+    }
+
+    /// <summary>
+    /// 获取单个预算统计信息
+    /// </summary>
+    [HttpGet]
+    public async Task<BaseResponse<BudgetDto>> GetStatisticsAsync([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>();
+
+            var currentAmount = await budgetService.CalculateCurrentAmountAsync(budget, referenceDate);
+            return BudgetDto.FromEntity(budget, currentAmount, referenceDate).Ok();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "获取预算统计失败, Id: {Id}", id);
+            return $"获取预算统计失败: {ex.Message}".Fail<BudgetDto>();
+        }
+    }
+
+    /// <summary>
+    /// 创建预算
+    /// </summary>
+    [HttpPost]
+    public async Task<BaseResponse<long>> CreateAsync([FromBody] CreateBudgetDto dto)
+    {
+        try
+        {
+            var budget = new BudgetRecord
+            {
+                Name = dto.Name,
+                Type = dto.Type,
+                Limit = dto.Limit,
+                Category = dto.Category,
+                SelectedCategories = dto.SelectedCategories != null ? string.Join(",", dto.SelectedCategories) : string.Empty,
+                StartDate = dto.StartDate ?? DateTime.Now,
+                LastSync = DateTime.Now
+            };
+
+            var success = await budgetService.AddAsync(budget);
+            if (success)
+            {
+                return budget.Id.Ok();
+            }
+            return "创建预算失败".Fail<long>();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "创建预算失败");
+            return $"创建预算失败: {ex.Message}".Fail<long>();
+        }
+    }
+
+    /// <summary>
+    /// 删除预算
+    /// </summary>
+    [HttpDelete("{id}")]
+    public async Task<BaseResponse> DeleteByIdAsync(long id)
+    {
+        try
+        {
+            var success = await budgetService.DeleteAsync(id);
+            return success ? BaseResponse.Done() : "删除预算失败".Fail();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "删除预算失败, Id: {Id}", id);
+            return $"删除预算失败: {ex.Message}".Fail();
+        }
+    }
+
+    /// <summary>
+    /// 切换预算暂停状态
+    /// </summary>
+    [HttpPost]
+    public async Task<BaseResponse> ToggleStopAsync([FromQuery] long id)
+    {
+        try
+        {
+            var success = await budgetService.ToggleStopAsync(id);
+            return success ? BaseResponse.Done() : "操作失败".Fail();
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "切换预算状态失败, Id: {Id}", id);
+            return $"操作失败: {ex.Message}".Fail();
+        }
+    }
+
+    /// <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>();
+        }
+    }
+}