Add Firebase Guardian Report

[google-labs-jules]

Added RELATORIO_GUARDIAO.md which details the findings of the Firebase Guardian analysis.
The report highlights:

• Synchronization status of users, userProgress, questions, and gamification collections.
• Warnings about missing deep validation for nested objects in gamification (achievements, missions).
• Missing type validations for specific fields like streak.longestStreak.
• Confirmation that unlockedWorlds is correctly validated in the rules.

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PR created automatically by Jules for task 9963986455848700589 started by @albertoivo

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Visit the preview URL for this PR (updated for commit 5167f08):

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[albertoivo]

Implemente tudo da seção: ⚠️ Avisos (Ação Sugerida)

[google-labs-jules]

Implemente tudo da seção: ⚠️ Avisos (Ação Sugerida)

Implementei as correções sugeridas para a coleção gamification.

Observação sobre unlockedWorlds:
Verifiquei o arquivo firestore.rules e o campo unlockedWorlds já estava presente na lista de campos permitidos (hasOnly) e possuía validação (is list) no bloco match /users/{userId}. Por este motivo, não foi necessária nenhuma alteração para este campo específico, e o relatório reflete que ele já está validado.

Para a coleção gamification, adicionei:

1. Validações de tipo explícitas para streak.longestStreak, inventory.equippedFrame, inventory.equippedTitle, stats.completedWorldIds.
2. Validação profunda (Deep Validation) para os mapas powerUps.inventory e powerUps.usesToday.

O arquivo RELATORIO_GUARDIAO.md foi atualizado para refletir essas correções.