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"

lib/resource/3588s/README.md

@@ -0,0 +1,39 @@
+# RK3588S demo resource
+
+This directory contains the LVGL demo binary deployed on RK3588S devices by `install.sh`.
+
+## Files
+
+- `demo` — prebuilt LVGL UI binary installed to `/usr/bin/demo` on RK3588S boards
+
+## Source
+
+Current binary source on the build machine:
+
+- `/home/sts/share/小屏demo开发指南/lvgl源码/lv_port_linux_v2/lv_port_linux/build/bin/demo`
+
+## Purpose
+
+This demo provides the small-screen UI used on RK3588S devices, including FIFO-based control through:
+
+- `/tmp/lvgl_cmd`
+
+Supported commands expected by the current clawd RK3588 LVGL backend include:
+
+- `show_text:AP`
+- `show_text:Conn`
+- `show_text:Err0`
+- `show_text:<PIN>`
+- `show_time`
+
+## Install behavior
+
+During `install.sh`, if `/proc/device-tree/model` matches `RK3588S`, clawd will:
+
+1. Back up existing `/usr/bin/demo` to `/usr/bin/demo.clawd-bak` if not already backed up
+2. Install this `demo` binary to `/usr/bin/demo`
+
+## Notes
+
+- The binary is hardware-specific and intended for RK3588S boards.
+- Replacing the binary should be done together with verification of `/tmp/lvgl_cmd` behavior and screen rendering.