feat: support HTTP URLs in Network Mock Settings

[amary21]

Description

This Pull Request introduces support for http:// URLs in the Network Mocking feature. Previously, the validation logic was restricted to https:// URLs only, which limited developers when testing against local development servers or non-secure staging environments.

Changes

• Updated MockSettingsViewModel.kt validation logic to permit both http and https protocols using URLUtil.
• Updated the UI error message to inform users that both http:// and https:// prefixes are now valid.

Technical Note: Cleartext Traffic (Debugging Only)

If you encounter a Cleartext HTTP traffic not permitted error while using http URLs (standard behavior on Android 9+), you can temporarily allow it by adding the following attribute to your AndroidManifest.xml:

<application
    android:usesCleartextTraffic="true"
    ...>
</application>

IMPORTANT

Security Warning: The usesCleartextTraffic attribute should ONLY be used for debugging and local testing. Do not enable this in production as it allows unencrypted network traffic, which poses a significant security risk.

Checklist

• Supports http:// URLs
• Supports https:// URLs
• Updated validation error messages