Document upstream provenance and fork differences

[Orua]

Summary

• identify LAN BRIDGE as an independently maintained derivative of git-liu835/codex-cn-bridge
• document the verified functional and packaging differences from upstream v0.3.22
• retain upstream attribution in NOTICE and LICENSE

Validation

• git diff --cached --check
• documentation-only change; no runtime behavior changed

[chatgpt-codex-connector]

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