fix: recreate API when Vite command changes

[XiNiHa]

Currently, this plugin doesn't work well in build when used with Astro. It's because the configResolved hook gets called three times: first with the serve command, then two builds for server and client. This breaks the current logic of caching the api object, since the command changes to build after the first serve step, while the isBuild property should change as the command parameter changes. This PR fixes the issue by checking if the command has changed.

[netlify[bot]]

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