allow disabling of server-proxy per route

[fago]

For https://www.drupal.org/project/lupus_decoupled/issues/3487123#comment-15921123 we need to disable CSR and server-proxy for preview roues. CSR can be disabled via nuxt route rules, but the server-proxy feature is currently a global switch. We need to improve this to allow a per roue switch while it's generally on.

[fago]

We could add our own setting or extend nuxt route rules with a new drupalApiProxy option.

// nuxt.config.ts
export default defineNuxtConfig({
  routeRules: {
    '/preview/**': { 
      ssr: false,
      drupalApiProxy: false
    }
  }
})

AI suggest to do it like this:

// module.ts
import type { RouteRules } from 'nitropack'

declare module 'nitropack' {
 interface RouteRules {
   drupalApiProxy?: boolean
 }
}

export default defineNuxtModule({
 setup(options, nuxt) {
   const processFetchOptions = (fetchOptions: UseFetchOptions<any> = {}) => {
     const route = useRoute()
     const routeRules = useRequestEvent()?.context?._nitro?.routeRules || {}
     const shouldUseProxy = routeRules.drupalApiProxy !== false

     if (config.serverApiProxy && shouldUseProxy) {
       fetchOptions.baseURL = '/api/drupal-ce'
     }
     else {
       fetchOptions.baseURL = fetchOptions.baseURL ?? getDrupalBaseUrl() + config.ceApiEndpoint
     }
     // rest of function
   }
 }
})

})