🛡️ Sentinel: [MEDIUM] Fix weak random number generation

[thirdeyenation]

🚨 Severity: MEDIUM
💡 Vulnerability: random.choices is used for security-sensitive operations like password and ID generation. random is a pseudo-random number generator that is not cryptographically secure and can be predictable.
🎯 Impact: Predictable ID generation and predictable root SSH passwords, which could allow an attacker to guess identifiers or passwords.
🔧 Fix: Replaced random.choices with the cryptographically secure secrets.choice module, according to Python security best practices.
✅ Verification: Ran unit tests and verified syntax.

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PR created automatically by Jules for task 14671712840848508246 started by @thirdeyenation

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