* fix(agent-task): resolve Copilot API URL dynamically
Query viewer.copilotEndpoints.api to get the correct Copilot API URL
for the user's host instead of hardcoding api.githubcopilot.com. This
fixes 401 errors for ghe.com tenancy users whose Copilot API lives at
a different endpoint.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
