Migrate menus and votes to Panorama UI Kit

Replace MenuManagerCS2 with Panorama UI Kit for the admin menus and
css_vote. Layout names (menu, vote, banner, toast) are configurable
under MenuConfig and preloaded on startup; MenuType is removed and
ConfigVersion bumped to 26.

- Drop MenuManagerApi.dll and the old chat menu classes
- Reference PanoramaUiKit.Shared.dll, bump CounterStrikeSharp to 1.0.376
- Add .editorconfig and CODING_CONVENTIONS.md, apply them codebase-wide
- Remove the CS2-SimpleAdmin-docs site
- Rewrite README for the fork

CS2-SimpleAdmin/Menus/UiKit.cs

@@ -0,0 +1,81 @@
+using CounterStrikeSharp.API.Core.Capabilities;
+using Microsoft.Extensions.Logging;
+using PanoramaUiKit.Shared.Api;
+using PanoramaUiKit.Shared.Banners;
+using PanoramaUiKit.Shared.Common;
+using PanoramaUiKit.Shared.Menus;
+using PanoramaUiKit.Shared.Toasts;
+using PanoramaUiKit.Shared.Votes;
+
+namespace CS2_SimpleAdmin.Menus;
+
+/// <summary>
+/// Access to the Panorama UI Kit plugin and the layouts SimpleAdmin draws on.
+/// </summary>
+internal static class UiKit
+{
+    private static readonly PluginCapability<IPanoramaUiKit> Capability = new(IPanoramaUiKit.CapabilityName);
+
+    internal static MenuLayout MenuLayout { get; private set; } = new() { Name = "uikit_menu" };
+
+    internal static VoteLayout VoteLayout { get; private set; } = new() { Name = "uikit_vote" };
+
+    internal static BannerLayout BannerLayout { get; private set; } = new() { Name = "uikit_banner" };
+
+    internal static ToastLayout ToastLayout { get; private set; } = new() { Name = "uikit_toast" };
+
+    /// <summary>
+    /// Resolved on every use so a hot reload of the kit is picked up.
+    /// </summary>
+    internal static IPanoramaUiKit? Instance
+    {
+        get
+        {
+            try
+            {
+                return Capability.Get();
+            }
+            catch (Exception)
+            {
+                return null;
+            }
+        }
+    }
+
+    internal static void Configure(MenuConfig config)
+    {
+        MenuLayout = new MenuLayout { Name = config.MenuLayout };
+        VoteLayout = new VoteLayout { Name = config.VoteLayout };
+        BannerLayout = new BannerLayout { Name = config.BannerLayout };
+        ToastLayout = new ToastLayout { Name = config.ToastLayout };
+    }
+
+    /// <summary>
+    /// Spawns the layouts up front: creating one on first use sends the client one big burst.
+    /// </summary>
+    internal static bool Preload(ILogger logger)
+    {
+        IPanoramaUiKit? kit = Instance;
+        if (kit == null)
+        {
+            logger.LogError("Panorama UI Kit not found: install PanoramaUiKit and shared/PanoramaUiKit.Shared.");
+            return false;
+        }
+
+        if (kit.Version != IPanoramaUiKit.ApiVersion)
+        {
+            logger.LogWarning("Panorama UI Kit API v{Running}, SimpleAdmin built against v{Built}.", kit.Version, IPanoramaUiKit.ApiVersion);
+        }
+
+        UiLayout[] layouts = [MenuLayout, VoteLayout, BannerLayout, ToastLayout];
+        foreach (UiLayout layout in layouts)
+        {
+            if (!kit.Preload(layout))
+            {
+                logger.LogError("Layout {Layout} was refused, see the Panorama UI Kit log.", layout);
+            }
+        }
+
+        return true;
+    }
+}