feat(市场数据服务): 添加获取价格和历史数据的模拟方法

新增 GetPriceAsync 和 GetHistoricalDataAsync 方法到 MockMarketDataService 类中，用于模拟市场数据服务。同时添加 Microsoft.Extensions.Caching.Abstractions 包依赖以支持后续缓存功能。

AssetManager.Infrastructure/AssetManager.Infrastructure.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <ItemGroup>
     <ProjectReference Include="..\AssetManager.Models\AssetManager.Models.csproj" />
@@ -6,6 +6,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="10.0.3" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
   </ItemGroup>

AssetManager.Infrastructure/Services/MockMarketDataService.cs

@@ -122,4 +122,50 @@ public class MockMarketDataService : IMarketDataService
 
         return data;
     }
+
+    // 新增到 MockMarketDataService 类中
+    public async Task<MarketPriceResponse> GetPriceAsync(string symbol, string assetType)
+    {
+        _logger.LogInformation("Mock 获取价格: {Symbol}, 资产类型: {AssetType}", symbol, assetType);
+        // Mock 一个随机价格
+        var random = new Random();
+        return await Task.FromResult(new MarketPriceResponse
+        {
+            Symbol = symbol,
+            Price = (decimal)(random.NextDouble() * 100 + 50),
+            PreviousClose = (decimal)(random.NextDouble() * 100 + 45),
+            Timestamp = DateTime.UtcNow,
+            AssetType = assetType
+        });
+    }
+
+    public async Task<List<MarketDataResponse>> GetHistoricalDataAsync(string symbol, string assetType, string timeframe, int limit)
+    {
+        _logger.LogInformation("Mock 获取历史数据: {Symbol}, 资产类型: {AssetType}, 周期: {Timeframe}, 数量: {Limit}",
+            symbol, assetType, timeframe, limit);
+        // Mock 历史数据
+        var result = new List<MarketDataResponse>();
+        var random = new Random();
+        var basePrice = (decimal)(random.NextDouble() * 100 + 50);
+
+        for (int i = 0; i < limit; i++)
+        {
+            var change = (decimal)(random.NextDouble() * 10 - 5);
+            basePrice += change;
+            result.Add(new MarketDataResponse
+            {
+                Symbol = symbol,
+                Open = basePrice - (decimal)random.NextDouble() * 2,
+                High = basePrice + (decimal)random.NextDouble() * 2,
+                Low = basePrice - (decimal)random.NextDouble() * 2,
+                Close = basePrice,
+                Volume = (decimal)random.NextDouble() * 1000000,
+                Timestamp = DateTime.UtcNow.AddDays(-(limit - i)),
+                AssetType = assetType
+            });
+        }
+
+        return await Task.FromResult(result);
+    }
+
 }