Document updated Juice agent setup behavior

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Summary

• Added Linux installer usage for agent-service installs, binary-only installs, quoted pool names, custom controllers, and service runtime flags.
• Updated Docker agent setup with --gpus all, required runtime environment variables, compose example, and current custom-image build prerequisites.
• Clarified Linux agent prerequisites and troubleshooting for missing installer libraries, skipped service creation, Docker UDP port publishing, and Kubernetes secret naming.

Source Coverage

• Verified against recent Juice-Labs/juice-oss changes for installer/install-juice.sh, docker/agent/Dockerfile, docker/agent/README.md, docker/agent/root/home/juice/start-agent.sh, and charts/agent/values.yaml.
• Relevant upstream PRs reviewed: installer: Decrease min glibc version and make juice pool optional juice-oss#6, Update cli-login.md. Correct m2m documentation, make it consistent #7, Add metrics to documentation #10, Update Manually Managing Sessions #11, and Verify for google crawler' #12.

Knowledge Gaps Addressed

• When INSTALL_JUICE_POOL is required and what happens if it is omitted.
• How to run Docker agents with GPU access and reachable host IP/UDP settings.
• Which dependency failures map to client-only versus agent-service installation paths.

Validation

• git diff --check
• npm run build (succeeds; existing site-wide edit-link warnings are still emitted)