feat(rk3588s): package lvgl demo and display backend

install.sh

@@ -158,6 +158,22 @@ chmod +x "$INSTALL_DIR/bin/clawd.js"
 
 info "clawd symlinked to /usr/local/bin/clawd"
 
+# Install RK3588S LVGL demo
+DEVICE_MODEL="$(tr -d '\0' </proc/device-tree/model 2>/dev/null || true)"
+if echo "$DEVICE_MODEL" | grep -qi 'RK3588S'; then
+  DEMO_SRC="$INSTALL_DIR/lib/resource/3588s/demo"
+  DEMO_DST="/usr/bin/demo"
+  if [ -f "$DEMO_SRC" ]; then
+    info "RK3588S detected, installing LVGL demo to $DEMO_DST"
+    if [ -f "$DEMO_DST" ] && [ ! -f "${DEMO_DST}.clawd-bak" ]; then
+      cp "$DEMO_DST" "${DEMO_DST}.clawd-bak"
+      info "Backup created: ${DEMO_DST}.clawd-bak"
+    fi
+    install -m 0755 "$DEMO_SRC" "$DEMO_DST"
+  else
+    warn "RK3588S demo binary not found: $DEMO_SRC"
+  fi
+fi
 
 # Write default config files
 mkdir -p "$CONFIG_DIR"