Add cockpit deployment package + single-instance guard

deploy/ builds a single zip for TeslaConsole: the self-contained tray app and
the signed ViGEmBus installer under a riojoy\ folder, with postinstall.bat at the
root. postinstall elevates and runs riojoy\install-rio.ps1, which installs
ViGEmBus silently (if absent) and registers RIOJoy to start at logon — no cert
trust, test signing, Secure Boot change, or reboot.

Also guard against two instances fighting over the COM port (machine-wide +
per-user autostart both firing): a per-session named mutex makes a second launch
exit immediately. Built zips (dist/) and the bundled installer (deploy/vendor/)
are git-ignored.

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

deploy/postinstall.bat

@@ -0,0 +1,29 @@
+@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 ===========================================================================
+setlocal
+title RIOJoy post-install
+
+rem --- elevate if we are not already administrator --------------------------
+net session >nul 2>&1
+if %errorlevel% neq 0 (
+    echo Requesting administrator privileges...
+    powershell -NoProfile -Command "Start-Process -FilePath '%~f0' -Verb RunAs"
+    exit /b 0
+)
+
+cd /d "%~dp0"
+
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0riojoy\install-rio.ps1"
+set RC=%errorlevel%
+
+echo.
+if %RC% neq 0 (
+    echo postinstall FAILED with exit code %RC%.
+) else (
+    echo postinstall completed.
+)
+exit /b %RC%