docs(nomad): set listen addresses via environment

[vvkio]

Summary

• update the Nomad job to set LOTUS_API_LISTENADDRESS and LOTUS_LIBP2P_LISTENADDRESSES
• document the new environment variables for the Nomad job
• note listen address change in the changelog

Testing

• go test ./... (fails: open /workspace/lotus/extern/filecoin-ffi/go.mod: no such file or directory)

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https://chatgpt.com/codex/tasks/task_e_687cd97c692483219a8891141e80a633

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