hysteria-scheduler service setup

- Create installation script to automate setup and migration from cron
- Update both install.sh and upgrade.sh to use the shared functions

core/scripts/scheduler.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+setup_hysteria_scheduler() {
+    echo "Setting up Hysteria scheduler service..."
+    
+    chmod +x /etc/hysteria/core/scripts/scheduler.py
+
+    cat > /etc/systemd/system/hysteria-scheduler.service << 'EOF'
+[Unit]
+Description=Hysteria2 Scheduler Service
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/etc/hysteria
+ExecStart=/etc/hysteria/hysteria2_venv/bin/python3 /etc/hysteria/core/scripts/scheduler.py
+Restart=always
+RestartSec=10
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=hysteria-scheduler
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+    systemctl daemon-reload
+    systemctl enable hysteria-scheduler.service
+    systemctl start hysteria-scheduler.service
+
+    (crontab -l | grep -v "hysteria2_venv.*traffic-status" | grep -v "hysteria2_venv.*backup-hysteria") | crontab -
+
+    echo "Hysteria scheduler service has been installed and started."
+    echo "You can check the status with: systemctl status hysteria-scheduler"
+    echo "Logs are available at: journalctl -u hysteria-scheduler"
+}
+
+check_scheduler_service() {
+    if systemctl is-active --quiet hysteria-scheduler.service; then
+        echo "Hysteria scheduler service is already active."
+        return 0
+    else
+        return 1
+    fi
+}
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    setup_hysteria_scheduler
+fi