Add Linux deployment scripts

- install.sh: Sets up /opt/kao with systemd service
- uninstall.sh: Clean removal
- Hide message when optimal (only show when something to report)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

uninstall.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Kao Uninstall Script
+
+set -e
+
+INSTALL_DIR="/opt/kao"
+SERVICE_FILE="/etc/systemd/system/kao.service"
+
+echo "===================================="
+echo "  Kao Uninstaller"
+echo "===================================="
+
+# Check permissions
+if [ ! -w "/opt" ]; then
+    echo "Error: Need write access"
+    echo "Run with: sudo $0"
+    exit 1
+fi
+
+# Stop and disable service
+echo "[1/3] Stopping service..."
+systemctl stop kao.service 2>/dev/null || true
+systemctl disable kao.service 2>/dev/null || true
+
+# Remove service file
+echo "[2/3] Removing systemd service..."
+rm -f "$SERVICE_FILE"
+systemctl daemon-reload
+
+# Remove install directory
+echo "[3/3] Removing files..."
+rm -rf "$INSTALL_DIR"
+
+echo ""
+echo "Kao has been uninstalled."