fix: support Nuxt 5

[onmax]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This updates the module compatibility range for Nuxt 5 and makes GraphQL Vite plugin registration idempotent.

Nuxt 5 invokes Vite configuration more than once. The module previously created and appended a new GraphQL plugin each time, so the second plugin tried to parse the JavaScript generated by the first plugin as GraphQL. Reusing one plugin instance and adding it only when it is absent preserves the existing Nuxt 4 path while allowing .gql imports to build on Nuxt 5/Nitro 3.

✅ Checks

• pnpm lint
• pnpm build
• pnpm dev:build (Nuxt 4.0.2 / Nitro 2.12.4)
• Clean consumer build with the packed module artifact and Nuxt 4.5.0 / Nitro 2.13.4
• Clean consumer build with the packed module artifact and Nuxt 5.0.0-0 / Nitro 3.0.260610-beta from Nuxt main via pkg.pr.new

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🔨 Latest commit	8d913d0