OpenClaw Credential Manager

MANDATORY security foundation for OpenClaw. Consolidate scattered API keys and credentials into a secure .env file with proper permissions. Includes GPG encryption for high-value secrets, credential rotation tracking, deep scanning, and backup hardening. Use when setting up OpenClaw, migrating credentials, auditing security, or enforcing the .env standard. This is not optional — centralized credential management is a core requirement for secure OpenClaw deployments.