新增删除组合接口：支持DELETE /api/v1/portfolio/{id}

AssetManager.API/Controllers/PortfolioController.cs

@@ -501,4 +501,94 @@ public class PortfolioController : ControllerBase
             });
         }
     }
+
+    /// <summary>
+    /// 删除投资组合
+    /// </summary>
+    /// <param name="id">投资组合ID</param>
+    /// <returns>删除结果</returns>
+    [HttpDelete("{id}")]
+    public async Task<ActionResult<ApiResponse<bool>>> DeletePortfolio(string id)
+    {
+        try
+        {
+            var userId = GetCurrentUserId();
+            if (string.IsNullOrEmpty(userId))
+            {
+                return Unauthorized(new ApiResponse<bool>
+                {
+                    code = AssetManager.Models.StatusCodes.Unauthorized,
+                    data = false,
+                    message = "用户未授权"
+                });
+            }
+
+            _logger.LogInformation($"Request to delete portfolio: {id}");
+            
+            var db = _databaseService.GetDb();
+            
+            // 校验组合是否存在且属于当前用户
+            var portfolio = db.Queryable<Portfolio>()
+                .Where(p => p.Id == id && p.UserId == userId)
+                .First();
+            
+            if (portfolio == null)
+            {
+                return NotFound(new ApiResponse<bool>
+                {
+                    code = AssetManager.Models.StatusCodes.NotFound,
+                    data = false,
+                    message = "投资组合不存在或无权限删除"
+                });
+            }
+
+            // 开启事务删除相关数据
+            db.Ado.BeginTran();
+            try
+            {
+                // 删除交易记录
+                db.Deleteable<Transaction>()
+                    .Where(t => t.PortfolioId == id)
+                    .ExecuteCommand();
+                
+                // 删除持仓
+                db.Deleteable<Position>()
+                    .Where(p => p.PortfolioId == id)
+                    .ExecuteCommand();
+                
+                // 删除组合本身
+                db.Deleteable<Portfolio>()
+                    .Where(p => p.Id == id)
+                    .ExecuteCommand();
+                
+                db.Ado.CommitTran();
+            }
+            catch (Exception ex)
+            {
+                db.Ado.RollbackTran();
+                _logger.LogError(ex, "删除投资组合事务失败");
+                throw;
+            }
+
+            _logger.LogInformation($"Portfolio {id} deleted successfully");
+            
+            return Ok(new ApiResponse<bool>
+            {
+                code = AssetManager.Models.StatusCodes.Success,
+                data = true,
+                message = "删除成功"
+            });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error deleting portfolio");
+            
+            return StatusCode(AssetManager.Models.StatusCodes.InternalServerError, new ApiResponse<bool>
+            {
+                code = AssetManager.Models.StatusCodes.InternalServerError,
+                data = false,
+                message = ex.Message
+            });
+        }
+    }
 }