Add comprehensive documentation for CLICD features and operations

- Introduced Container Management documentation covering lifecycle operations, resource management, and console access.
- Added Dashboard documentation detailing metrics and related APIs.
- Created Host Report documentation summarizing host environment and resource status.
- Included Image Management documentation for template handling and management actions.
- Documented Networking and Routing features including NAT4 and IPv6 management.
- Added Security Alerts documentation outlining alert scenarios and API usage.
- Created Snapshot Management documentation for snapshot operations and scheduling.
- Documented Sub-user management for granting access to specific containers.
- Added Configuration guide detailing runtime settings and security recommendations.
- Created Installation guide for setting up CLICD with requirements and steps.
- Added Introduction and Quick Start guides for new users.
- Documented Upgrade process with version checking and pre-upgrade checklist.
- Created Deployment guide for service exposure and firewall recommendations.
- Added FAQ section addressing common questions and concerns.
- Documented Troubleshooting steps for common issues encountered.

docs/en/guide/installation.md

@@ -0,0 +1,46 @@
+# Installation
+
+CLICD provides a one-line installer. By default, it installs the latest version from GitHub Releases. You can also pin a specific version with an environment variable.
+
+## Requirements
+
+- Linux x86_64 host.
+- Root privileges.
+- systemd.
+- Network access to GitHub Release downloads.
+- LXC runtime support if you want to use LXC.
+- KVM virtualization enabled with libvirt/QEMU installed if you want to use KVM.
+
+## Install the Latest Version
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/MengMengCode/CLICD/main/install.sh | sudo sh
+```
+
+The script defaults to `CLICD_VERSION=latest`, which downloads `clicd-linux-amd64.tar.gz` from `releases/latest`.
+
+## Install a Specific Version
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/MengMengCode/CLICD/main/install.sh | sudo CLICD_VERSION=v1.1.6 sh
+```
+
+Replace `v1.1.6` with the release tag you want to install.
+
+## Open the Panel
+
+After installation, open:
+
+```text
+http://YOUR_SERVER_IP:8999
+```
+
+Use the administrator credentials printed by the installer for the first login. In production, restrict access at the firewall or reverse proxy layer and change the default username and password as soon as possible.
+
+## Uninstall
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/MengMengCode/CLICD/main/install.sh | sudo sh -s -- uninstall
+```
+
+Before uninstalling, decide whether you need to keep containers, image cache, database files, or configuration files.