🛡️ Sentinel: [CRITICAL] Fix path truncation vulnerability

[EffortlessSteven]

🚨 Severity: CRITICAL
💡 Vulnerability: The validate_model_request function validated file extensions using .ends_with(), but failed to reject null bytes (\0). This allowed attackers to pass inputs like model\0.gguf which passes the extension check but truncates the path when passed to underlying C/OS APIs, potentially bypassing directory restrictions.
🎯 Impact: If exploited, this could allow an attacker to read arbitrary files from the server's filesystem by truncating the file extension in a path that passes the initial validation.
🔧 Fix: Added explicit rejection of null bytes in validate_model_request.
✅ Verification: Run cargo test -p bitnet-server --lib security::tests::test_model_path_null_byte_rejection to verify the fix.

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PR created automatically by Jules for task 10714908133883951932 started by @EffortlessSteven

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