fix: API路由重构以匹配前端期望

1. 创建交易: POST /api/v1/portfolio/{id}/transactions -> POST /api/v1/portfolio/transactions
   - portfolioId 改为在 body 中传递

2. 新增计算净值端点: POST /api/v1/portfolio/{id}/nav-history/calculate

前端 API 格式已完全对齐

AssetManager.API/Controllers/PortfolioController.cs

@@ -270,18 +270,56 @@ public class PortfolioController : ControllerBase
     }
 
     /// <summary>
-    /// 创建交易（买入/卖出）
+    /// 计算投资组合当日净值
     /// </summary>
-    [HttpPost("{id}/transactions")]
-    public async Task<ActionResult<ApiResponse<TransactionItem>>> CreateTransaction(
-        string id,
-        [FromBody] CreateTransactionRequest request)
+    [HttpPost("{id}/nav-history/calculate")]
+    public async Task<ActionResult<ApiResponse<object>>> CalculateDailyNav(string id)
     {
         var userId = GetCurrentUserId();
         
         try
         {
-            var transaction = await _portfolioFacade.CreateTransactionAsync(id, request, userId);
+            var success = await _portfolioFacade.CalculateDailyNavAsync(id);
+            return Ok(new ApiResponse<object>
+            {
+                code = Models.StatusCodes.Success,
+                data = new { portfolioId = id, calculated = success },
+                message = success ? "净值计算成功" : "净值计算失败"
+            });
+        }
+        catch (Exception ex)
+        {
+            return BadRequest(new ApiResponse<object>
+            {
+                code = Models.StatusCodes.BadRequest,
+                data = null,
+                message = ex.Message
+            });
+        }
+    }
+
+    /// <summary>
+    /// 创建交易（买入/卖出）
+    /// </summary>
+    [HttpPost("transactions")]
+    public async Task<ActionResult<ApiResponse<TransactionItem>>> CreateTransaction(
+        [FromBody] CreateTransactionRequest request)
+    {
+        var userId = GetCurrentUserId();
+        
+        if (string.IsNullOrEmpty(request.PortfolioId))
+        {
+            return BadRequest(new ApiResponse<TransactionItem>
+            {
+                code = Models.StatusCodes.BadRequest,
+                data = null,
+                message = "portfolioId 不能为空"
+            });
+        }
+        
+        try
+        {
+            var transaction = await _portfolioFacade.CreateTransactionAsync(request.PortfolioId, request, userId);
             return Ok(new ApiResponse<TransactionItem>
             {
                 code = Models.StatusCodes.Success,

AssetManager.Services/IPortfolioFacade.cs

@@ -61,4 +61,9 @@ public interface IPortfolioFacade
     /// 获取用户总资产
     /// </summary>
     Task<TotalAssetsResponse> GetTotalAssetsAsync(string userId);
+    
+    /// <summary>
+    /// 计算投资组合当日净值
+    /// </summary>
+    Task<bool> CalculateDailyNavAsync(string portfolioId);
 }

AssetManager.Services/PortfolioFacade.cs

@@ -195,4 +195,13 @@ public class PortfolioFacade : IPortfolioFacade
         _logger.LogInformation("获取用户总资产: {UserId}", userId);
         return await _portfolioService.GetTotalAssetsAsync(userId);
     }
+
+    /// <summary>
+    /// 计算投资组合当日净值
+    /// </summary>
+    public async Task<bool> CalculateDailyNavAsync(string portfolioId)
+    {
+        _logger.LogInformation("计算投资组合当日净值: {PortfolioId}", portfolioId);
+        return await _navService.CalculateAndSaveDailyNavAsync(portfolioId);
+    }
 }