fix: fix import routers into another router

[dilane3]

🔗 Related Issue

Import routers into another doesn't work as expected

🚀 Type of Change

• 📖 Documentation (Updates to README, API docs, or comments)
• 🐞 Bug Fix (Non-breaking fix for an issue)
• ⚡ Performance (Optimizations for faster execution)
• ✨ Feature (New functionality without breaking changes)
• 🔧 Refactor (Code improvements without changing behavior)
• 🧹 Chore (Build process, tooling, dependencies)
• ⚠️ Breaking Change (Modifications that impact existing usage)

📜 Description

When initializing a new project with typescript especially, after having defined two separated routers and importing one into the main one, the app crashed directly because the typescript type doesn't fit.

The import property of the defineRouter function required a table of RouterComponent but received a Promise<RouterComponent>

✅ Checklist

• I have linked a related issue or discussion.
• I have updated documentation if needed.
• I have tested the changes in a real project.
• I have added tests or confirmed that existing tests pass.