Add production network administration workflows

[franckferman]

Summary

• add net doctor, wait, certificate audit, DNS health, local inventory, and batch formats
• add IANA IP classification and IPAM audit, contains, exclude, and nth-address operations
• add explicit IEEE OUI cache updates and local vendor lookup
• add platform and release-aware generators plus structured legacy reference metadata
• refresh the one-file package, README, built-in help, and version to 4.0.0
• expand coverage to 81 standard-library tests

Validation

• Python 3.14 compile, mypy, and warning-as-error unit suite
• Python 3.13 compile and warning-as-error unit suite
• isolated wheel build, install, and console-script smoke test
• live doctor, TLS, DNS fallback, local inventory, and IEEE OUI checks