docs: add completed per-IP rule limits plan (#480)

## Summary
- Add the completed per-IP rule limits implementation plan to docs.
- Mark all task steps complete and reference PR #479 plus tag
3.0.0-beta2.

## Test Plan
- [x] Verified no unchecked plan step boxes remain
- [x] Reviewed docs diff for accidental secrets or unrelated content
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sagit
2026-04-28 10:31:49 +08:00
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