fix(schema)!: use strict typescript mode by default

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#15327

❓ 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This enables TypeScript's strict mode by default for users who are using TS. This is a better default and best practice.

👉 Migration

Users can disable this if they prefer.

export default defineNuxtConfig({
  typescript: {
    strict: false
  }
})

📝 Checklist

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

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[pi0]

(merged too early types need to be updated!)

[danielroe]

pr already open :-)