docs: add GitHub Copilot CLI to supported clients

[GeekTrainer]

Adds GitHub Copilot CLI to the list of supported clients in both Docker and Node configuration examples.

Changes

• Added GitHub Copilot CLI alongside Claude Desktop, Claude Code, and Cursor in configuration examples

This is a minimal documentation update to help Copilot CLI users discover that the configuration examples apply to their tool.

[CLAassistant]

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[GeekTrainer]

Question - would this fall under a small code exception since it's a small docs update, or will you need a CLA to be signed?

[akirayamamoto]

@GeekTrainer thanks for your collaboration. Unfortunately, yes, the PR is blocked and we cannot merge without the CLA.