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/features/dashboard.md

@@ -0,0 +1,27 @@
+# Dashboard
+
+The dashboard shows the overall state of the host and virtualization resources.
+
+## Metrics
+
+- Total containers, running containers, and stopped containers.
+- CPU, memory, disk, and Swap overview.
+- Entry points for host network and routing status.
+- Task queue status.
+- Security alert summary.
+
+## Related APIs
+
+```http
+GET /api/v1/dashboard
+GET /api/v1/host-info
+GET /api/v1/routing
+GET /api/v1/ipv6/status
+GET /api/v1/tasks
+```
+
+API requests must include an API key:
+
+```bash
+curl -H "X-API-Key: YOUR_API_KEY" https://panel.example.com/api/v1/dashboard
+```