feat: auto-integrate desktop shortcuts into openbox right-click menu

- Scan .desktop files from ~/Desktop/ on startup and dynamically add
  them to the openbox menu (/config/.config/openbox/menu.xml)
- Resolve icon names to actual paths under /config/proot-apps/ with
  fallback to system icons, preferring 256x256 resolution
- Escape XML entities in name, exec command, and icon path
- Only reconfigure openbox when menu content actually changes
- Update README.md and README_en.md with new feature description

root/scripts/start.sh

@@ -8,10 +8,52 @@ if [ ! -f /config/.config/openbox/rc.xml ] || grep -A20 "<dock>" /config/.config
     openbox --reconfigure
 fi
 
-# update openbox menu if differs from default
-if [ ! -f /config/.config/openbox/menu.xml ] || ! cmp /defaults/menu.xml /config/.config/openbox/menu.xml; then
-    mkdir -p /config/.config/openbox
-    cp /defaults/menu.xml /config/.config/openbox/menu.xml
+# generate openbox menu
+mkdir -p /config/.config/openbox
+cp /defaults/menu.xml /tmp/menu.xml
+
+if ls "$HOME/Desktop/"*.desktop >/dev/null 2>&1; then
+    for desktop_file in "$HOME/Desktop/"*.desktop; do
+        name=$(grep -E "^Name=" "$desktop_file" | head -n 1 | cut -d "=" -f 2-)
+        exec_cmd=$(grep -E "^Exec=" "$desktop_file" | head -n 1 | cut -d "=" -f 2-)
+        icon=$(grep -E "^Icon=" "$desktop_file" | head -n 1 | cut -d "=" -f 2-)
+        
+        # strip %U, %u, %F, %f
+        exec_cmd=$(echo "$exec_cmd" | sed 's/ %[fFuU]//g')
+        
+        # resolve icon path if it's just a name (not an absolute path)
+        if [ -n "$icon" ] && [ "${icon#/}" = "$icon" ]; then
+            icon_resolved=""
+            # search in proot-apps icons (prefer 256x256)
+            for size in 256x256 512x512 128x128 64x64 48x48 scalable; do
+                found=$(find /config/proot-apps/*/usr/share/icons/hicolor/"$size"/apps/"$icon".* 2>/dev/null | head -n 1)
+                if [ -n "$found" ]; then
+                    icon_resolved="$found"
+                    break
+                fi
+            done
+            # fallback: search system icons
+            if [ -z "$icon_resolved" ]; then
+                found=$(find /usr/share/icons/hicolor/*/apps/"$icon".* 2>/dev/null | head -n 1)
+                [ -n "$found" ] && icon_resolved="$found"
+            fi
+            [ -n "$icon_resolved" ] && icon="$icon_resolved"
+        fi
+        
+        # handle missing icon
+        [ -z "$icon" ] && icon="/usr/share/pixmaps/xterm-color_48x48.xpm"
+        
+        # escape XML entities
+        exec_cmd=$(echo "$exec_cmd" | sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g')
+        name=$(echo "$name" | sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g')
+        icon=$(echo "$icon" | sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g')
+        
+        sed -i "/<menu id=\"root-menu\" label=\"MENU\">/a \\<item label=\"${name}\" icon=\"${icon}\"><action name=\"Execute\"><command>${exec_cmd}</command></action></item>" /tmp/menu.xml
+    done
+fi
+
+if [ ! -f /config/.config/openbox/menu.xml ] || ! cmp /tmp/menu.xml /config/.config/openbox/menu.xml; then
+    cp /tmp/menu.xml /config/.config/openbox/menu.xml
     openbox --reconfigure
 fi