feat: setup db context with initial models

src/FiscalOS.API/Data/MigrationService.cs

@@ -0,0 +1,25 @@
+namespace FiscalOS.API.Data;
+
+internal sealed class MigrationService(
+  IServiceProvider serviceProvider,
+  ILogger<MigrationService> logger
+) : IHostedService
+{
+  private readonly IServiceProvider _serviceProvider = serviceProvider;
+
+  public async Task StartAsync(CancellationToken cancellationToken)
+  {
+    logger.LogInformation("Applying database migrations...");
+
+    using var scope = _serviceProvider.CreateScope();
+    var context = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+    await context.Database.MigrateAsync(cancellationToken);
+
+    logger.LogInformation("Database migrations applied.");
+  }
+
+  public Task StopAsync(CancellationToken cancellationToken)
+  {
+    return Task.CompletedTask;
+  }
+}