feat: expose host-agnostic AiRouter DI

Author: dhhieu113pro

src/AiRouter/DependencyInjection.cs

@@ -0,0 +1,28 @@
+using AiRouter.Configuration;
+using AiRouter.Providers;
+using AiRouter.Routing;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+
+namespace Microsoft.Extensions.DependencyInjection;
+
+public static class AiRouterServiceCollectionExtensions
+{
+    public static IServiceCollection AddAiRouter(
+        this IServiceCollection services,
+        Action<AiRouterOptions>? configure = null)
+    {
+        ArgumentNullException.ThrowIfNull(services);
+
+        var options = new AiRouterOptions();
+        configure?.Invoke(options);
+
+        services.TryAddSingleton(options);
+        services.TryAddSingleton<IProviderStore, InMemoryProviderStore>();
+        services.TryAddSingleton<IRouteStore, InMemoryRouteStore>();
+        services.TryAddSingleton<IProviderManager, ProviderManager>();
+        services.TryAddSingleton<RouteResolver>();
+        services.TryAddSingleton<IAiRouter, AiRouterService>();
+
+        return services;
+    }
+}