feat(start-tunnel): help sidebar, i18n, table sorting; rename Port Forwards to Published Ports

[MattDHill]

Summary

StartTunnel UI + docs feature work, rolled into the unreleased 1.1.0 release (no version bump). Backend/RPC/CLI are untouched; changes are confined to projects/start-tunnel/ (web + docs) plus the i18n check-script split.

• Contextual help sidebar — a Help toggle opens per-screen guidance, with in-dialog help for the add/edit flows; each panel links to the docs.
• Internationalization — the UI is fully wired for translation (an i18n pipe + per-language dictionaries + a Settings language selector, persisted in localStorage), reusing the shared Start9 i18n service/tokens/switcher. English and Spanish ship; German/French/Polish fall back to English until their dictionaries are filled in.
• Sortable table columns across Subnets, Devices, Published Ports, and DNS (Taiga tuiTable), with numeric comparators for ports/IPs.
• Renamed Port Forwards → Published Ports across the web UI and docs (folder, route, components, help keys, strings); the per-device "Auto Port Forward" capability → "Auto-publish". The CLI (port-forward / pinhole) and RPC surface are unchanged.
• DNS "Name" column → "Hostname"; reordered the Published Ports columns (IP last).
• Docs — expanded the Subnets and DNS Records pages (subnet range is configurable, DNS use-case + mechanics); renamed the Port Forwarding page to Published Ports.

Implementation note: start-tunnel keeps its own local i18n dictionaries (like start-wrt), so check:i18n:tunnel was added and start-tunnel removed from the shared check-i18n scan.

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