fix(dashboard): bypass CDN cache for devices.json fetch

[ccasanueva7]

Summary

• Adds cache: 'no-store' and timestamp query param to the devices.json fetch
• GitHub Pages CDN was caching the old devices.json (with wrong place names bpi_r4_1, openwrt_one_1) even after a new deployment
• The correct place names bananapi_bpi-r4 and openwrt_one are already in develop but the browser/CDN kept serving the stale file