Switch dashboard storage to SQL Server

Replaced file-based dashboard storage with SQL Server-backed storage using the new SqlDashboardStorage class and TBDD_SMF_CONFIG table. Updated Program.cs to use the new storage and ensure default dashboards are loaded into the database. Simplified DefaultDashboard.xml to remove old items. Added SQL script for the dashboard storage table. Cleaned up unused folder references in the project file. This centralizes dashboard management and supports multi-instance scenarios.

DbFirst.API/Program.cs

@@ -1,4 +1,5 @@
 using DbFirst.API.Middleware;
+using DbFirst.API.Dashboards;
 using DbFirst.Application;
 using DbFirst.Application.Repositories;
 using DbFirst.Domain;
@@ -10,6 +11,7 @@ using DevExpress.DashboardAspNetCore;
 using DevExpress.DashboardCommon;
 using DevExpress.DashboardWeb;
 using DevExpress.DataAccess.Json;
+using System.Xml.Linq;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -108,7 +110,10 @@ builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvi
     }
 
     DashboardConfigurator configurator = new DashboardConfigurator();
-    configurator.SetDashboardStorage(new DashboardFileStorage(dashboardsPath));
+
+    var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
+    var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG");
+    configurator.SetDashboardStorage(dashboardStorage);
 
     DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
     DashboardJsonDataSource jsonDataSourceUrl = new DashboardJsonDataSource("JSON Data Source (URL)");
@@ -126,6 +131,10 @@ builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvi
     dataSourceStorage.RegisterDataSource(catalogsJsonDataSource.Name, catalogsJsonDataSource.SaveToXml());
 
     configurator.SetDataSourceStorage(dataSourceStorage);
+
+    EnsureDashboardInStorage(dashboardStorage, "DefaultDashboard", defaultDashboardPath);
+    EnsureDashboardInStorage(dashboardStorage, "CatalogsGrid", catalogsGridDashboardPath);
+
     return configurator;
 });
 
@@ -150,3 +159,15 @@ app.MapDashboardRoute("api/dashboard", "DefaultDashboard");
 app.MapControllers();
 
 app.Run();
+
+static void EnsureDashboardInStorage(IEditableDashboardStorage storage, string id, string filePath)
+{
+    var exists = storage.GetAvailableDashboardsInfo().Any(info => string.Equals(info.ID, id, StringComparison.OrdinalIgnoreCase));
+    if (exists || !File.Exists(filePath))
+    {
+        return;
+    }
+
+    var doc = XDocument.Load(filePath);
+    storage.AddDashboard(doc, id);
+}