explorer: hide testnet network while it's temporarily offline (#0340)

[trevormil]

Summary

• BitBadges testnet is being temporarily shut down to save infra costs. Once it goes offline, the testnet entry would otherwise show "disconnected" forever in the network dropdown.
• The deployed Ping.pub UI auto-discovers chains via import.meta.glob('../../chains/mainnet/*.json') in src/stores/useDashboard.ts. Moving bitbadges-testnet.json out of chains/mainnet/ is enough to hide the network from the switcher.
• The chain config is preserved at chains/disabled/bitbadges-testnet.json (via git mv, history preserved) so reviving testnet later is just a git mv back.

Notes

• The runtime hostname check in useDashboard.ts (window.location.hostname.search('testnet') > -1) is intentionally left alone — it's not the user-visible network switcher, and removing the chain config file is enough to hide the network from the dropdown. Touching useDashboard.ts risks breaking the testnet host detection logic for when the testnet host eventually comes back.
• No code changes — only a file move.

Tracked as ticket ping-pub#340 in the autopilot repo.

Test plan

• Build the deployed Vue app locally: npm run build-only and confirm no build errors
• Run dev server and confirm bitbadges-testnet no longer appears in the network dropdown
• Confirm bitbadges-mainnet still works normally
• After merge + deploy, verify https://explorer.bitbadges.io shows only mainnet in the switcher
• When testnet returns: git mv chains/disabled/bitbadges-testnet.json chains/mainnet/bitbadges-testnet.json and redeploy

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