Nezha (#16025)

* Add nezha (ct)

* Update author in nezha.sh script

* Fix dashboard file handling in nezha.sh

* Update author information in nezha-install.sh

---------

Co-authored-by: push-app-to-main[bot] <203845782+push-app-to-main[bot]@users.noreply.github.com>
Co-authored-by: Tobias <96661824+CrazyWolf13@users.noreply.github.com>

install/nezha-install.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: MickLesk (CanbiZ)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://github.com/nezhahq/nezha
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+fetch_and_deploy_gh_release "nezha" "nezhahq/nezha" "prebuild" "latest" "/opt/nezha" "dashboard-linux-amd64.zip"
+
+msg_info "Preparing Application Files"
+if [[ -f /opt/nezha/dashboard-linux-amd64 ]]; then
+  mv /opt/nezha/dashboard-linux-amd64 /opt/nezha/dashboard
+fi
+chmod +x /opt/nezha/dashboard
+mkdir -p /opt/nezha/data
+msg_ok "Prepared Application Files"
+
+msg_info "Creating Service"
+cat <<EOF >/etc/systemd/system/nezha.service
+[Unit]
+Description=Nezha Monitoring Dashboard
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/opt/nezha
+ExecStart=/opt/nezha/dashboard
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+systemctl enable -q --now nezha
+msg_ok "Created Service"
+
+motd_ssh
+customize
+cleanup_lxc