feat: add format=jpgEnc support (filename from rpt_CertificatesChartsAlias SP)

CertReports.Syncfusion/Services/Implementations/ChartDataServiceV2.cs

@@ -14,6 +14,12 @@ namespace CertReports.Syncfusion.Services.Implementations;
 public interface IChartDataServiceV2
 {
     Task<ChartDataV2?> GetChartDataV2Async(string isin);
+
+    /// <summary>
+    /// Ritorna l'AliasID codificato per il grafico (SP rpt_CertificatesChartsAlias).
+    /// Usato dal formato jpgEnc per impostare il nome file nella risposta HTTP.
+    /// </summary>
+    Task<string?> GetChartAliasAsync(string isin);
 }
 
 public class ChartDataServiceV2 : IChartDataServiceV2
@@ -104,6 +110,19 @@ public class ChartDataServiceV2 : IChartDataServiceV2
         return result;
     }
 
+    public async Task<string?> GetChartAliasAsync(string isin)
+    {
+        await using var conn = new SqlConnection(_connectionString);
+        await conn.OpenAsync();
+
+        await using var cmd = new SqlCommand("rpt_CertificatesChartsAlias", conn)
+            { CommandType = CommandType.StoredProcedure };
+        cmd.Parameters.AddWithValue("@isin", isin);
+
+        var result = await cmd.ExecuteScalarAsync();
+        return result == null || result == DBNull.Value ? null : result.ToString();
+    }
+
     /// <summary>
     /// Legge un campo numerico come decimal indipendentemente dal tipo SQL
     /// (decimal, float, real, int). Necessario perché cedlab_Chart_UL1 ritorna