Deploy: RIOJoy payload folder + pre-uninstall cleanup

Rename the package payload folder to RIOJoy (was riojoy) so it extracts
to C:\games\RIOJoy, and add a pre-uninstall path the console can run
before deleting the folder.

- pre-uninstall.bat (inside RIOJoy\): self-elevating entry point that
  runs uninstall-rio.ps1.
- uninstall-rio.ps1: stops the tray app, removes the HKLM Run entry,
  uninstalls ViGEmBus (-KeepDriver to skip), and clears per-user config
  for every profile (-KeepConfig to skip). Idempotent and non-fatal.
- build-package.ps1 bundles both; README documents the uninstall flow.

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

deploy/postinstall.bat

@@ -1,8 +1,8 @@
 @echo off
 rem ===========================================================================
 rem  RIOJoy cockpit post-install entry point (run by TeslaConsole).
-rem  Sits beside the 'riojoy' payload folder; elevates, then runs
-rem  riojoy\install-rio.ps1.
+rem  Sits beside the 'RIOJoy' payload folder; elevates, then runs
+rem  RIOJoy\install-rio.ps1.
 rem ===========================================================================
 setlocal
 title RIOJoy post-install
@@ -17,7 +17,7 @@ if %errorlevel% neq 0 (
 
 cd /d "%~dp0"
 
-powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0riojoy\install-rio.ps1"
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0RIOJoy\install-rio.ps1"
 set RC=%errorlevel%
 
 echo.