[New Module] Add username support for mix.py

[kaifcodec]

Description

Add a new username validation module named mix.py. This module should be placed in the user_scanner/user_scan/social/ directory.

Technical Details

• Site Name: Mix
• Base URL: https://mix.com/{username}/
• Category: social

Instructions for Contributors

1. Analyze the Target: Use Browser DevTools, a Proxy, or curl to analyze how the site responds. Note that Mix may use redirects for non-existent profiles.
2. Validation Logic: * Always prefer using generic_validate() with a process callback.
   • Inspect the response body for unique strings. For example, a valid profile might contain <title>@, while a non-existent one might return a 302 status or the string "The best content from the open web".
   • Avoid using status_validate() (status codes only) unless the site provides zero unique strings.
3. Bot Detection & CAPTCHAs: If your analysis reveals that the site is heavily protected by CAPTCHAs, Cloudflare challenges, or aggressive anti-bot blocks that prevent consistent scanning, report it immediately in the comments so we can close the issue.
4. Manual Recon: Manually test with a known existing account and a guaranteed non-existent account to find the most reliable identifiers in the response body.
5. Code Consistency: Check the existing modules in user_scan/social/ to ensure your implementation matches our current structure and imports.
6. Local Verification: Run the tool locally and verify your module works as expected before submitting your PR.