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/run_desktop_app.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+
+# Test script for the Jarvis Desktop App
+
+# Parse arguments
+VOICE_DEBUG=0
+for arg in "$@"; do
+    case $arg in
+        --voice-debug)
+            VOICE_DEBUG=1
+            shift
+            ;;
+    esac
+done
+
+# Navigate to project root first
+cd "$(dirname "$0")/.." || exit
+
+echo "🔧 Testing Jarvis Desktop App locally..."
+if [ "$VOICE_DEBUG" = "1" ]; then
+    echo "   📋 Voice debug: ENABLED"
+fi
+echo ""
+
+# Find a suitable Python (3.10+)
+# Check both PATH and common install locations (homebrew, deadsnakes, etc.)
+PYTHON=""
+SEARCH_PATHS=(
+    ""                          # PATH lookup
+    "/opt/homebrew/bin/"        # macOS Homebrew (Apple Silicon)
+    "/usr/local/bin/"           # macOS Homebrew (Intel) / Linux manual installs
+)
+for candidate in python3.12 python3.11 python3.10; do
+    for prefix in "${SEARCH_PATHS[@]}"; do
+        if [ -x "${prefix}${candidate}" ] 2>/dev/null || command -v "${prefix}${candidate}" &>/dev/null; then
+            PYTHON="${prefix}${candidate}"
+            break 2
+        fi
+    done
+done
+if [ -z "$PYTHON" ]; then
+    # Fall back to python3 and hope it's new enough
+    PYTHON="python3"
+fi
+
+# Set up / activate virtual environment
+if [ ! -d .venv ]; then
+    echo "📦 Creating virtual environment..."
+    "$PYTHON" -m venv .venv
+fi
+source .venv/bin/activate
+
+# Check Python version
+echo "📋 Checking Python version..."
+python --version
+PY_MINOR=$(python -c 'import sys; print(sys.version_info.minor)')
+if [ "$PY_MINOR" -lt 10 ]; then
+    echo "⚠️  Python 3.10+ is required. Found $(python --version)."
+    echo "   Recreating .venv with $PYTHON..."
+    deactivate 2>/dev/null
+    rm -rf .venv
+    "$PYTHON" -m venv .venv
+    source .venv/bin/activate
+    echo "   Now using: $(python --version)"
+fi
+echo ""
+
+# Install dependencies from requirements.txt
+echo "📦 Installing dependencies..."
+pip install -q -r requirements.txt
+echo ""
+
+# Generate icons
+echo "🎨 Generating icons..."
+python src/desktop_app/desktop_assets/generate_icons.py
+echo ""
+
+# Run the desktop app
+echo "🚀 Starting desktop app..."
+echo "   Click the system tray icon to open menu"
+echo "   Select 'Start Listening' from menu to begin"
+echo "   Or press Ctrl+C to quit"
+echo ""
+
+# Set PYTHONPATH to include src directory (already at project root)
+export PYTHONPATH="$(pwd)/src:$PYTHONPATH"
+
+# Set voice debug environment variable if requested
+if [ "$VOICE_DEBUG" = "1" ]; then
+    export JARVIS_VOICE_DEBUG=1
+fi
+
+python -m desktop_app
+