Add Discord-native hybrid front-end for Jarvis (bot + bridge)

Transform isair/jarvis into a Discord-controlled voice assistant running on
the Ubuntu VNC desktop, keeping the mature ~39k-line Python brain intact.

- bot/ (Node + bun, discord.js): /자비스 slash commands (ephemeral),
  voice channel join + voice receive/playback, pluggable VNC screen broadcast
  (selfbot live / noVNC / screenshot)
- bridge/ (Python, Flask): wraps jarvis STT + run_reply_engine + Piper TTS
  behind a thin localhost HTTP API
- .env.example, scripts/ (start_bridge/start_bot/dev), README rewrite,
  docs/language-comparison.md and docs/vnc-xfce-setup.md

Language decision: hybrid (Python brain + Node/bun Discord layer) because
Discord blocks bot video; native screen broadcast only works via a Node
selfbot library.

scripts/test_bundled_app.bat

@@ -0,0 +1,59 @@
+@echo off
+REM Test script to build and run the bundled Windows app locally
+
+echo.
+echo === Building Jarvis Desktop App with PyInstaller ===
+echo.
+
+REM Get to project root
+cd /d "%~dp0\.."
+
+REM Set up paths
+set "PROJECT_ROOT=%cd%"
+set "MAMBA_ENV=%PROJECT_ROOT%\.mamba_env"
+set "PYTHONPATH=%PROJECT_ROOT%\src;%PYTHONPATH%"
+
+REM Check if mamba environment exists
+if not exist "%MAMBA_ENV%\python.exe" (
+    echo ERROR: Mamba environment not found at %MAMBA_ENV%
+    echo    Please run the setup script first.
+    pause
+    exit /b 1
+)
+
+REM Clean previous builds
+echo Cleaning previous builds...
+if exist "build" rmdir /s /q build
+if exist "dist" rmdir /s /q dist
+echo.
+
+REM Build with PyInstaller
+echo Building app bundle...
+"%MAMBA_ENV%\python.exe" -m PyInstaller jarvis_desktop.spec
+echo.
+
+REM Check if build succeeded
+if exist "dist\Jarvis.exe" (
+    echo Build successful!
+    echo.
+    echo App location: %cd%\dist\Jarvis.exe
+    echo.
+
+    REM Show file info
+    echo File info:
+    dir dist\Jarvis.exe
+    echo.
+
+    REM Run the app
+    echo Launching app...
+    echo    Press Ctrl+C in this window to stop the app
+    echo.
+
+    dist\Jarvis.exe
+
+    echo.
+    echo App exited.
+) else (
+    echo Build failed! Check the output above for errors.
+    exit /b 1
+)