fix: 策略相关修复

1. GetPortfolioDetailAsync: 移除硬编码逻辑模型信息
   - 根据策略ID从数据库读取真实策略信息
   - 无策略时返回 null，前端显示'未绑定策略'

2. GetStrategies: 修复返回格式
   - 改为返回 { items: [...] } 格式，匹配前端期望
   - 修复 StrategyListResponse.Items 类型为 StrategyListItemDto

AssetManager.API/Controllers/StrategyController.cs

@@ -64,7 +64,7 @@ public class StrategyController : ControllerBase
     /// 此接口用于获取当前登录用户的所有策略列表。
     /// </remarks>
     [HttpGet("strategies")]
-    public ActionResult<ApiResponse<List<StrategyListItemDto>>> GetStrategies()
+    public ActionResult<ApiResponse<StrategyListResponse>> GetStrategies()
     {
         try
         {
@@ -74,12 +74,12 @@ public class StrategyController : ControllerBase
             var strategies = _strategyService.GetStrategies(userId);
             var strategyListItems = strategies.Select(MapToStrategyListItemDTO).ToList();
 
-            _logger.LogInformation("Strategies retrieved successfully");
+            _logger.LogInformation("Strategies retrieved successfully, count: {Count}", strategyListItems.Count);
             
-            return Ok(new ApiResponse<List<StrategyListItemDto>>
+            return Ok(new ApiResponse<StrategyListResponse>
             {
                 code = AssetManager.Models.StatusCodes.Success,
-                data = strategyListItems,
+                data = new StrategyListResponse { Items = strategyListItems },
                 message = "Success"
             });
         }
@@ -87,7 +87,7 @@ public class StrategyController : ControllerBase
         {
             _logger.LogError(ex, "Error retrieving strategies");
             
-            return StatusCode(AssetManager.Models.StatusCodes.InternalServerError, new ApiResponse<List<StrategyListItemDto>>
+            return StatusCode(AssetManager.Models.StatusCodes.InternalServerError, new ApiResponse<StrategyListResponse>
             {
                 code = AssetManager.Models.StatusCodes.InternalServerError,
                 data = null,

AssetManager.Models/DTOs/StrategyDTO.cs

@@ -5,7 +5,7 @@ namespace AssetManager.Models.DTOs;
 /// </summary>
 public class StrategyListResponse
 {
-    public List<StrategyItem>? Items { get; set; }
+    public List<StrategyListItemDto>? Items { get; set; }
 }
 
 /// <summary>

AssetManager.Services/PortfolioService.cs

@@ -550,27 +550,48 @@ public class PortfolioService : IPortfolioService
         decimal TotalReturn = totalPortfolioValue - totalCost;
         double totalReturnRate = totalCost > 0 ? (double)(TotalReturn / totalCost * 100) : 0;
 
+        // 获取策略信息（如果有的话）
+        StrategyInfo? strategyInfo = null;
+        string? logicModel = null;
+        string? logicModelStatus = null;
+        string? logicModelDescription = null;
+        
+        if (!string.IsNullOrEmpty(portfolio.StrategyId))
+        {
+            var strategy = _db.Queryable<Strategy>()
+                .Where(s => s.Id == portfolio.StrategyId)
+                .First();
+            
+            if (strategy != null)
+            {
+                strategyInfo = new StrategyInfo
+                {
+                    Id = strategy.Id,
+                    Name = strategy.Name,
+                    Description = strategy.Description
+                };
+                logicModel = strategy.Name;
+                logicModelStatus = "监控中";
+                logicModelDescription = strategy.Description;
+            }
+        }
+
         return new PortfolioDetailResponse
         {
             Id = portfolio.Id,
             Name = portfolio.Name,
             Currency = targetCurrency,
             Status = portfolio.Status,
-            Strategy = new StrategyInfo
-            {
-                Id = portfolio.StrategyId,
-                Name = "策略名称",
-                Description = "策略描述"
-            },
+            Strategy = strategyInfo,
             PortfolioValue = (double)totalPortfolioValue,
             TotalReturn = (double)TotalReturn,
             TodayProfit = (double)totalTodayProfit,
             HistoricalChange = totalReturnRate,
-            DailyVolatility = 0, // 后续实现
+            DailyVolatility = 0,
             TodayProfitCurrency = targetCurrency,
-            LogicModel = "HFEA 风险平价逻辑",
-            LogicModelStatus = "监控中",
-            LogicModelDescription = "目标权重 季度调仓",
+            LogicModel = logicModel,
+            LogicModelStatus = logicModelStatus,
+            LogicModelDescription = logicModelDescription,
             TotalItems = Positions.Count,
             TotalRatio = 100.0,
             Positions = positionItems

sql/fix_strategy_id_nullable.sql

@@ -0,0 +1,7 @@
+-- 修改 portfolios 表 strategy_id 字段允许 NULL
+-- 组合可能不使用任何策略，所以应该允许 NULL
+
+ALTER TABLE portfolios MODIFY COLUMN strategy_id VARCHAR(50) NULL;
+
+-- 验证
+DESCRIBE portfolios;