many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Creators/DependencyInjection.cs

@@ -0,0 +1,35 @@
+using Hutopy.Modules.Creators.Configuration;
+using Hutopy.Modules.Creators.Contracts;
+using Hutopy.Modules.Creators.Data;
+using Hutopy.Modules.Creators.Services;
+
+namespace Hutopy.Modules.Creators;
+
+public static class DependencyInjection
+{
+    public static WebApplicationBuilder AddCreatorModule(
+        this WebApplicationBuilder builder,
+        Action<DbContextOptionsBuilder>? configureAction = null)
+    {
+        builder.Services.Configure<CreatorOptions>(
+            builder.Configuration.GetSection(CreatorOptions.ConfigurationSection));
+        builder.Services.AddScoped<SlugPurger>();
+        
+        builder.Services.AddDbContext<CreatorsDbContext>(configureAction);
+        builder.Services.AddTransient<ICreatorLookup, CreatorLookup>();
+        
+        return builder;
+    }
+    
+    public static async Task<IApplicationBuilder> UseCreatorModuleAsync(
+        this IApplicationBuilder app,
+        CancellationToken cancellationToken = default)
+    {
+        var scopeFactory = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>();
+        using var scope = scopeFactory.CreateScope();
+        await using var context = scope.ServiceProvider.GetRequiredService<CreatorsDbContext>();
+        await context.Database.MigrateAsync(cancellationToken: cancellationToken);
+
+        return app;
+    }
+}