When pulse-sensor-proxy runs inside a container (Docker/LXC), it cannot
complete SSH workflows properly, leading to continuous [preauth] log floods
on the Proxmox host. This happens because the proxy is meant to run on the
host, not inside the container.
Changes:
- Import internal/system for InContainer() detection
- Add startup warning when running in containerized environment
- Point users to docs/TEMPERATURE_MONITORING.md for correct setup
- Allow suppression via PULSE_SENSOR_PROXY_SUPPRESS_CONTAINER_WARNING=true
This catches the misconfiguration early and directs users to supported
installation methods, preventing the SSH spam reported in discussion #628.
b5ef239973