When pulse-sensor-proxy is installed, automatically remove old SSH keys that were stored in the container for security.
Changes:
**install-sensor-proxy.sh:**
- Checks container for SSH private keys (id_rsa, id_ed25519, etc.)
- Removes any found keys from container
- Warns user that legacy keys were cleaned up
- Explains proxy now handles SSH
**Setup script (config_handlers.go):**
- After successful proxy install, removes old SSH keys from all cluster nodes
- Cleans up authorized_keys entries that match the old container-based key
- Keeps only proxy-managed keys (pulse-sensor-proxy comment)
This provides a clean migration path from the old direct-SSH method to the secure proxy architecture. Users upgrading from pre-v4.24 versions get automatic cleanup of insecure container-stored keys.
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