Add firebase-security-skill (MIT auditor for Firestore/RTDB rules)

[Perufitlife]

Adding firebase-security-skill to the Other section.

It's an MIT-licensed auditor that probes anonymously to confirm:

• Firestore security rules with allow read: if true patterns
• Realtime DB rules permissive across paths
• Public Storage buckets with broad read access
• Weak auth provider configurations (anonymous sign-in left enabled, no email verification, etc.)

I scanned 77 random Firebase projects from public GitHub commits — 22% leaked user data anonymously (writeup: perufitlife.github.io/supabase-security-skill/blog/scanned-100-supabase-projects.html).

Hosted run on Apify (no install): apify.com/renzomacar/firebase-security-auditor.