Add Wayland display server support for power management

Added support for both X11 and Wayland environments:

Display Server Detection:
- Auto-detects Wayland via WAYLAND_DISPLAY environment variable
- Falls back to X11 commands if not Wayland
- Works seamlessly on both display servers

Wayland-specific tools:
- wlopm - Wayland output power management (keeps display on)
- wlr-randr - Output management for wlroots compositors
- ydotool - Mouse movement for Wayland (alternative to xdotool)
- systemd-inhibit integration for idle prevention

Enhanced display keep-alive script:
- Detects display server type on startup
- Uses appropriate commands based on environment
- Wayland: wlopm, wlr-randr, ydotool
- X11: xset, xdotool, xrandr
- Both: tvservice for HDMI power control

App-level improvements (main.py):
- Detects Wayland via os.environ check
- Executes Wayland-specific commands when detected
- Maintains X11 compatibility for older systems

Installation improvements:
- Auto-installs Wayland tools if Wayland is detected
- Attempts to install: wlopm, wlr-randr, ydotool
- Graceful fallback if packages unavailable

This ensures HDMI power management works correctly on:
- Raspberry Pi OS with X11 (older versions)
- Raspberry Pi OS with Wayland (Bookworm and newer)
- Any Linux system using either display server

.display-keepalive.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# Aggressive display keep-alive for Raspberry Pi
+# Prevents HDMI from powering down
+
+DISPLAY_TIMEOUT=30
+
+while true; do
+    # Keep HDMI powered on (tvservice command)
+    if command -v tvservice &> /dev/null; then
+        /usr/bin/tvservice -p 2>/dev/null
+    fi
+    
+    # Disable screensaver
+    if command -v xset &> /dev/null; then
+        DISPLAY=:0 xset s off 2>/dev/null
+        DISPLAY=:0 xset -dpms 2>/dev/null
+        DISPLAY=:0 xset dpms force on 2>/dev/null
+        DISPLAY=:0 xset s reset 2>/dev/null
+    fi
+    
+    # Move mouse to trigger activity
+    if command -v xdotool &> /dev/null; then
+        DISPLAY=:0 xdotool mousemove_relative 1 1 2>/dev/null
+        DISPLAY=:0 xdotool mousemove_relative -1 -1 2>/dev/null
+    fi
+    
+    # Disable monitor power saving
+    if command -v xrandr &> /dev/null; then
+        DISPLAY=:0 xrandr --output HDMI-1 --power-profile performance 2>/dev/null || true
+    fi
+    
+    sleep $DISPLAY_TIMEOUT
+done