feat: add Pinchflat to Authelia access control

Add pinchflat.media.pivoine.art to protected services requiring
one-factor authentication via Authelia SSO.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

net/authelia/configuration.yml

@@ -73,6 +73,7 @@ access_control:
         - "proxy.pivoine.art"
         - "admin.asciinema.dev.pivoine.art"
         - "facefusion.ai.pivoine.art"
+        - "pinchflat.media.pivoine.art"
       policy: one_factor