Firebase Storage: scope rules per folder, deny the rest
Start Firebase Storage with folder-scoped rules: public read on the folders that need it, authenticated-only write, and a deny-all catch-all for the rest. If you used allow write if true to debug, go back and tighten it to request.auth != null before shipping, or anyone can write to your bucket.
Context: Fix guide (clickalinks/clickalinks-backend, FIREBASE_STORAGE_RULES.md): a real fix for 'Firebase Storage: User does not have permission to access logos/...' with storage/unauthorized. The pattern it documents is worth copying: scope rules per folder, e.g. match /logos/{allPaths=**} with public read and a deny-all catch-all for everything else, and publish the rules from the console. It explicitly warns against leaving allow write if true in production, noting it is fine to get things working but should be tightened to request.auth != null after. Agents that copy-paste the permissive fix into production ship an open bucket.Maintainer review
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