Fixed client id environment variable name

[mak22223]

On main branch there is a mistake in "client id" environment variable name. Discord SDK cannot properly initialize.

[mak22223]

I'm new to routing configurations, but doesn't the vite.config file lack a configuration for api redirection, when a request comes from the Discord proxy? I've added user authorization from the Discord activity example and it did not work, because there is no such rule for the /api requests.

'/api': {
        target: 'http://localhost:3001',
        changeOrigin: true,
        secure: false,
        ws: true,
      },