Add a Hiddify-ready import snippet to sample profiles

[Copilot]

This change adds a minimal snippet that can be imported directly into Hiddify and surfaced through the existing free-profile catalog. The snippet composes the existing official WARP sample with Hiddify-specific headers so it is usable as a ready-to-run example.

• New sample snippet

  • Added test.configs/hiddify_snippet
  • Defines standard profile metadata
  • Enables fragmentation via Hiddify headers
  • Reuses the existing test.configs/warp profile instead of duplicating config content

• Expose in free-profile catalog

  • Added a new Hiddify Snippet entry to test.configs/free_configs
  • Makes the snippet discoverable through the existing in-app free profile flow
  • Marks the profile with the fragment feature flag and descriptive tags

• Documentation

  • Added the raw import URL to test.configs/README.md so the snippet can be copied into Hiddify directly

Example snippet:

#profile-title: Hiddify Snippet
#profile-update-interval: 24
#subscription-userinfo: upload=0; download=0; total=10737418240000000; expire=2546249531
#support-url: https://t.me/hiddify
#profile-web-page-url: https://hiddify.com
#enable-fragment: true

https://raw.githubusercontent.com/hiddify/hiddify-app/refs/heads/main/test.configs/warp

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