🛡️ Sentinel: [CRITICAL] Fix path truncation via null byte injection

[EffortlessSteven]

🚨 Severity: CRITICAL
💡 Vulnerability: The validate_model_request function in bitnet-server did not validate against null bytes (\0). This allowed an attacker to bypass the .gguf extension restriction by providing a path like secret.txt\0.gguf. Because underlying C APIs (e.g., llama.cpp) terminate strings at the null byte, the server could be tricked into loading an arbitrary file (like secret.txt) despite the Rust-level validation succeeding.
🎯 Impact: Attackers could potentially read arbitrary files on the system or load malicious data by bypassing the intended file extension restrictions, leading to sensitive data exposure or server compromise.
🔧 Fix: Added explicit rejection of the null byte (\0) in the path validation logic of validate_model_request.
✅ Verification: Run cargo test -p bitnet-server --lib security::tests::test_model_path_null_byte_rejection.

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PR created automatically by Jules for task 10483477058716141903 started by @EffortlessSteven

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