🔒 [security fix] require authentication for dynamic levels and configurations

[eng618]

🎯 What: The Firestore security rules for levels and config collections (levels_dev, levels_preview, levels_prod, configs_dev, configs_preview, configs_prod) have been updated to require authentication.

⚠️ Risk: Left unfixed, any unauthenticated user or agent could read full level structures and application configs directly from Cloud Firestore, bypassing game progression constraints, scraping full game assets, and generating excessive bandwidth costs / read transactions.

🛡️ Solution: Changed allow read: if true; to allow read: if request.auth != null; in firestore.rules.

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PR created automatically by Jules for task 14004013882777709147 started by @eng618

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[codacy-production]

Up to standards ✅

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