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When a client reconnects while the backend is still in its rate-limit protection phase, the weather module has no data to show and stays on `Loading...` until the next scheduled API call. This mainly affects server mode setups, where the server keeps running while a remote client temporarily loses its connection and reloads. It was [raised in the forum](https://forum.magicmirror.builders/topic/20218/request-loop-loading...-in-standard-weather-module-open-meteo-after-update/11?_=1777106416020) and is worthy of a fix to improve the user experience. With this PR the node helper caches the last successful `WEATHER_DATA` payload per instance and replays it immediately on reconnect. The client gets its last known state right away instead of waiting for the next fetch. The cache is cleaned up when the provider stops. Tests are included to cover reconnect with and without cached data, and the cleanup path.