feat(lint): add reentrancy-eth lint

[figtracer]

Summary

• rename the existing reentrancy-unlimited-gas lint surface to reentrancy-eth
• keep the detector focused on uncapped ETH-transferring low-level calls where state read before the call is written after it
• ignore zero-value calls backed by literal zero or constant-zero values
• update lint docs, README entry, and UI fixtures for the new lint ID/help URL

Testing

• cargo fmt --check
• cargo test -p forge --test ui ReentrancyEth
• cargo test -p forge-lint sol::tests::registered_lints_have_docs
• git diff --check

[mablr]

Some clanker findings, reproduced locally

[mattsse]

One small cleanup from re-checking the latest head.