Add option to install a userscript instead of manually copying the tracking script

app/Server/Endpoints/GetUserscriptEndpoint.cs

@@ -0,0 +1,18 @@
+using System.Threading;
+using System.Threading.Tasks;
+using DHT.Server.Service.Middlewares;
+using DHT.Utils.Resources;
+using Microsoft.AspNetCore.Http;
+
+namespace DHT.Server.Endpoints;
+
+[ServerAuthorizationMiddleware.NoAuthorization]
+sealed class GetUserscriptEndpoint(ResourceLoader resources) : BaseEndpoint {
+	protected override async Task Respond(HttpRequest request, HttpResponse response, CancellationToken cancellationToken) {
+		const string FileName = "dht.user.js";
+		const string ResourcePath = "Tracker/loader/" + FileName;
+		
+		byte[]? resourceBytes = await resources.ReadBytesAsyncIfExists(ResourcePath);
+		await WriteFileIfFound(response, FileName, resourceBytes, cancellationToken);
+	}
+}