nebula-mesh: Newly-minted operator API key exposed in redirect URL (Referer, history, proxy logs)

internal/web/operators.go:251 — after handleOperatorCreateAPIKey mints a fresh 32-byte bearer token, the redirect points the operator's browser at: /ui/operators/?newkey=&keyname= The raw API key ends up: - in the browser's URL history - in the Referer header on every cross-origin asset the detai...