fix(nuxt)!: allow app:rendered to modify ssr context and add render:html

[pi0]

🔗 Linked issue

Resolves nuxt/nuxt#14537

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• [x 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

We were calling app:rendered hook just after ssr rendering is being done in Nuxt 3 <= 3.0.0-rc.6. #6042 changed this behavior in v3.0.0-rc.7 that app:rendered is being called with new rendered context to have access to constructed html but this means, it is too late to modify payload.

This PR reverts app:rendered back to previous behavior with new limited { ssrContext } context only. (breaking change)

Nitro plugins have access to the final rendered context via render:html (breaking change: nuxt:app:rendered renamed for nitro plugins to be simpler, consistent with render:response hook and not confused with app:rendered lifecycle hook)

Example usage: (nitro plugin)

// server/plugins/render.ts
export default defineNitroPlugin((nitroApp) => {
  nitroApp.hooks.hook('render:html', (html, { event }) => { console.log({ html }) })
  nitroApp.hooks.hook('render:response', (response, { event }) => { console.log(response) })
})

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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