docs(monitor-config): sync the framework README pair with the user-provided versions

Replaces tools/grafana/framework/README.md and README.zh-CN.md with the
English and Chinese documents supplied by the maintainer, keeping the
established target filenames and the single Grafana README pair.

Both files are byte-identical to the provided sources. No other path,
runtime module, Jsonnet production source, test or PR body claim about
code is touched, and tools/grafana/README.md is not restored.

Author: a550580874