Introduce an optional ClickStack observability install (HyperDX UI + OTel Collector + MongoDB). Adds a Whiptail prompt to enable ClickStack and adjusts default resource suggestions when selected. Updates ct/clickhouse.sh to include observability tag, author, update logic to auto-update HyperDX and the OTel Collector, and prints appropriate access URLs. Extends install/clickhouse-install.sh to install dependencies, initialize ClickHouse schemas for logs/traces/sessions, deploy the OTel Collector with a ClickHouse exporter, clone/build HyperDX, create systemd services (clickstack-otel, clickstack-api, clickstack-app), and enable them. Updates json/clickhouse.json to include an informational note about the optional ClickStack requirements and usage.
Introduce ClickHouse support by adding a container template (ct/clickhouse.sh), an installer script (install/clickhouse-install.sh) and app metadata (json/clickhouse.json). The installer configures ClickHouse to listen on 0.0.0.0, restarts the service, and performs OS update, networking checks, MOTD/customization and cleanup. Metadata declares default resources (2 CPU, 4GB RAM, 10GB disk), interface port 8123, documentation/website links, and a warning about the default user having no password.
