fix: align phone number validation across registration and profile update

[tylrx404]

Related Issue

Closes #964

📌 Summary

This PR resolves the inconsistent phone number validation between the registration and profile update flows.

✅ Changes Made

• Removed the redundant 10-digit validation from auth.controller.js since registerSchema already validates phone numbers using validator.isMobilePhone(..., "any").
• Updated the registration phone input to allow international phone number formats (+, spaces, and hyphens).
• Updated profile phone validation to accept international phone numbers instead of enforcing a strict 10-digit format.

🎯 Result

Registration and profile update now follow consistent validation behavior and support both local and international phone numbers.

🧪 Testing

• ✅ Registered a user using an international phone number.
• ✅ Verified profile update accepts international phone numbers.
• ✅ Confirmed local phone numbers continue to work.
• ✅ Ran git diff --check successfully.

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