Upgrade DNS plugin and add forked QR/Explore plugins

[tonythethompson]

Update nu_plugin_dns to Nu 0.114.1 and introduce forked nu_plugin_qr_maker and nu_plugin_explore, pending CI verification and manifest/README sync.

[linear-code]

NUM-92

[coderabbitai]

🔗 Related PRs

#1 - Promote nu_plugin_skim as first Batch 1 CI build [merged]
#2 - Promote nu_plugin_desktop_notifications as Batch 1 CI build [merged]
#17 - Promote emoji, json_path, parquet for Nu 0.114 [merged]
#66 - docs: sync roadmap and backlog with live CI-built plugins [merged]
#75 - feat: Nu 0.114 wave — dns upgrade + 2 forked plugins [open]

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