sync with master fully

osu.Game/Configuration/WelcomeMusicMode.cs

@@ -0,0 +1,11 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Configuration
+{
+    public enum WelcomeMusicMode
+    {
+        Default,
+        Custom
+    }
+}

osu.Game/Online/API/Requests/GetMusicCategoriesRequest.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Online.API.Requests.Responses;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class GetMusicCategoriesRequest : APIRequest<APIBackgroundCategories>
+    {
+        protected override string Target => @"https://osu.jvnko.boats/welcome-music/categories";
+    }
+}

osu.Game/Online/API/Requests/GetWelcomeMusicRequest.cs

@@ -0,0 +1,21 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Net;
+using osu.Game.Online.API.Requests.Responses;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class GetWelcomeMusicRequest : APIRequest<List<APIWelcomeMusic>>
+    {
+        private readonly string category;
+
+        public GetWelcomeMusicRequest(string category)
+        {
+            this.category = category;
+        }
+
+        protected override string Target => $"https://osu.jvnko.boats/welcome-music/list?category={WebUtility.UrlEncode(category)}";
+    }
+}

osu.Game/Online/API/Requests/Responses/APIWelcomeMusic.cs

@@ -0,0 +1,17 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using Newtonsoft.Json;
+
+namespace osu.Game.Online.API.Requests.Responses
+{
+    // Описывает один трек, как он приходит с сервера
+    public class APIWelcomeMusic
+    {
+        [JsonProperty("name")]
+        public string? Name { get; set; }
+
+        [JsonProperty("url")]
+        public string? Url { get; set; }
+    }
+}

osu.Game/Screens/Menu/IntroFade.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Screens;
+using osu.Game.Audio;
+
+namespace osu.Game.Screens.Menu
+{
+    public partial class IntroFade : OsuScreen
+    {
+        [Resolved]
+        private WelcomeMusicManager? musicManager { get; set; }
+
+        public override void OnEntering(ScreenTransitionEvent e)
+        {
+            base.OnEntering(e);
+
+            this.FadeInFromZero(1000, Easing.OutQuint);
+
+#pragma warning disable CS8602 // Разыменование вероятной пустой ссылки.
+            var track = musicManager.GetPreloadedTrack();
+#pragma warning restore CS8602 // Разыменование вероятной пустой ссылки.
+            track?.Start();
+
+            Scheduler.AddDelayed(() => this.Push(new MainMenu()), 2000);
+        }
+    }
+}