fix(configure): use number schema for SMTP_PORT and update tests

[bdwd-dev]

Ensure SMTP_PORT is validated using Env.schema.number() instead of string. Also updates configure.spec.ts to cover the correct behavior.

🔗 Linked issue

❓ Type of change

• 🐞 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

Fixes #118

Ensure SMTP_PORT is validated as a number instead of a string during configure.

✅ Changes

• Use Env.schema.number() for SMTP_PORT
• Keep other env variables as strings
• Update configure.spec.ts to cover this behavior

🧪 Result

Correct typing for SMTP port and improved test coverage.

📝 Checklist

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

[thetutlage]

Thanks 🙏

[bdwd-dev]

welcome