fix: generate templates based on middleware dir

[wattanx]

🔗 Linked issue

#468

❓ 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

Generate template based on middleware dir since middleware is not recognized when created in middleware dir when generated from router.middleware.

📝 Checklist

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