Add signed ViGEmBus virtual-joystick support (Xbox 360)

Replace the test-signed RioGamepad driver as the default joystick output with a
ViGEmBus virtual Xbox 360 controller (Nefarius.ViGEm.Client) — properly signed,
so it installs with no test-signing / Secure Boot change / reboot.

The coordinator now selects ViGEm first, then the RioGamepad HID feeder, then a
no-op. The XInput layout caps joystick buttons at 11, so the editor's joystick
picker lists the named Xbox buttons (A, B, X, Y, LB, RB, Back, Start, L3, R3,
Guide); the hat maps to the D-pad and the six axes to the sticks + triggers.
Bind anything beyond 11 to the keyboard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RioJoy.Tray/Editor/ProfileEditorForm.cs

@@ -1,7 +1,7 @@
 using System.Runtime.Versioning;
 using System.Text;
 using RioJoy.Core.Editing;
-using RioJoy.Core.Hid;
+using RioJoy.Core.Output;
 using RioJoy.Core.Mapping;
 using RioJoy.Core.Profiles;
 using RioJoy.Core.Protocol;
@@ -262,8 +262,9 @@ public sealed class ProfileEditorForm : Form
                     _valueCombo.Items.Add(new ValueItem(k.Name, k.Value));
                 break;
             case RioRouteKind.Joystick:
-                for (int btn = 1; btn <= RioHidReport.ButtonCount; btn++)
-                    _valueCombo.Items.Add(new ValueItem($"Button {btn}", (byte)btn));
+                // The signed ViGEmBus Xbox 360 pad exposes 11 buttons; show their names.
+                for (int btn = 1; btn <= ViGEmJoystickSink.MappableButtonCount; btn++)
+                    _valueCombo.Items.Add(new ValueItem($"Button {btn} ({ViGEmJoystickSink.ButtonNames[btn - 1]})", (byte)btn));
                 break;
             case RioRouteKind.Hat:
                 foreach (RioHat h in new[] { RioHat.Up, RioHat.Right, RioHat.Down, RioHat.Left })