feat: Add main application views and structure

- Implemented CreateInstanceView for creating new instances.
- Added HostsView for managing SSH hosts with CRUD operations.
- Created InstancesView for displaying and managing instances.
- Developed LogsView for viewing operation logs.
- Introduced SecretsView for managing secrets associated with hosts.
- Established SettingsView for configuring application settings.
- Created MainWindow as the main application window with navigation.
- Added app manifest and configuration files for logging and settings.

OTSSignsOrchestrator.Core/Data/DesignTimeDbContextFactory.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.DataProtection;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace OTSSignsOrchestrator.Core.Data;
+
+/// <summary>
+/// Design-time factory for EF Core migrations tooling.
+/// </summary>
+public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<XiboContext>
+{
+    public XiboContext CreateDbContext(string[] args)
+    {
+        var optionsBuilder = new DbContextOptionsBuilder<XiboContext>();
+        optionsBuilder.UseSqlite("Data Source=design-time.db");
+
+        // Set up a temporary DataProtection provider for design-time use
+        var services = new ServiceCollection();
+        services.AddDataProtection()
+            .SetApplicationName("OTSSignsOrchestrator");
+        var sp = services.BuildServiceProvider();
+        var dpProvider = sp.GetRequiredService<IDataProtectionProvider>();
+
+        return new XiboContext(optionsBuilder.Options, dpProvider);
+    }
+}