Add Full HD display configuration to startup script

- Added configure_display_resolution() function to force 1920x1080 output
- Supports three methods: xrandr (X11), tvservice (RPi native), /boot/config.txt (persistent)
- Ensures player displays Full HD on screens larger than 1920x1080
- Configuration runs automatically on each startup

start.sh

@@ -99,6 +99,80 @@ load_user_environment() {
 # Load the user environment early
 load_user_environment
 
+# Function to configure display output to Full HD (1920x1080)
+configure_display_resolution() {
+    log_message "🖥️  Configuring display output to Full HD (1920x1080)..."
+    
+    # Method 1: Try xrandr (works on X11 systems)
+    if command -v xrandr &>/dev/null && [ -n "$DISPLAY" ]; then
+        log_message "Attempting to set resolution via xrandr..."
+        
+        # Get the primary display
+        primary_display=$(xrandr --query 2>/dev/null | grep " connected" | grep "primary\|preferred" | head -n 1 | awk '{print $1}')
+        
+        if [ -z "$primary_display" ]; then
+            primary_display=$(xrandr --query 2>/dev/null | grep " connected" | head -n 1 | awk '{print $1}')
+        fi
+        
+        if [ -n "$primary_display" ]; then
+            # Set output to 1920x1080 @ 60Hz
+            xrandr --output "$primary_display" --mode 1920x1080 --rate 60 2>/dev/null
+            if [ $? -eq 0 ]; then
+                log_message "✓ Display resolution set to 1920x1080 via xrandr"
+                return 0
+            fi
+        fi
+    fi
+    
+    # Method 2: Try tvservice (native Raspberry Pi tool)
+    if command -v tvservice &>/dev/null; then
+        log_message "Attempting to set resolution via tvservice (RPi native)..."
+        
+        # Get current HDMI status
+        hdmi_mode=$(tvservice -s 2>/dev/null | grep -oP 'DMT mode \K\d+')
+        
+        # Set to HDMI mode 16 (1920x1080 @ 60Hz) - standard Full HD
+        tvservice -e "DMT 16" 2>/dev/null
+        if [ $? -eq 0 ]; then
+            log_message "✓ Display resolution set to 1920x1080 via tvservice (DMT mode 16)"
+            return 0
+        fi
+    fi
+    
+    # Method 3: Configure via /boot/config.txt (persistent RPi config)
+    if [ -f "/boot/config.txt" ] && command -v sudo &>/dev/null; then
+        log_message "Checking /boot/config.txt for display settings..."
+        
+        # These settings ensure Full HD output on large displays
+        if ! grep -q "hdmi_group=2" /boot/config.txt; then
+            log_message "Adding HDMI display configuration to /boot/config.txt..."
+            # Backup config first
+            sudo cp /boot/config.txt /boot/config.txt.backup.$(date +%s)
+            
+            # Add Full HD configuration
+            echo "" | sudo tee -a /boot/config.txt > /dev/null
+            echo "# Kiwy Signage Player - Full HD Display Configuration" | sudo tee -a /boot/config.txt > /dev/null
+            echo "hdmi_group=2" | sudo tee -a /boot/config.txt > /dev/null        # DMT (monitor timings)
+            echo "hdmi_mode=16" | sudo tee -a /boot/config.txt > /dev/null        # 1920x1080 @ 60Hz
+            echo "hdmi_drive=2" | sudo tee -a /boot/config.txt > /dev/null        # Normal HDMI mode
+            echo "disable_overscan=1" | sudo tee -a /boot/config.txt > /dev/null  # Disable overscan
+            echo "framebuffer_width=1920" | sudo tee -a /boot/config.txt > /dev/null
+            echo "framebuffer_height=1080" | sudo tee -a /boot/config.txt > /dev/null
+            
+            log_message "✓ HDMI configuration added to /boot/config.txt"
+            log_message "⚠️  Display settings require reboot to take effect"
+            return 0
+        else
+            log_message "✓ /boot/config.txt already configured for Full HD"
+        fi
+    fi
+    
+    log_message "Display configuration completed (1920x1080 Full HD target)"
+}
+
+# Configure display before starting player
+configure_display_resolution
+
 # Function to check if player is healthy
 check_health() {
     # Check if heartbeat file exists and is recent (within last 60 seconds)