Allow llama.cpp reasoning preservation flags

[cmizzi]

This PR adds --reasoning-preserve and --no-reasoning-preserve to the llama.cpp runtime flag allowlist.

These flags are supported by llama.cpp and are boolean-only options. They do not access files or external resources, so they fit the existing security model used for runtime flag validation. --reasoning-preserve is important for reasoning models because it keeps the reasoning trace in the conversation history, allowing prompt/KV cache reuse when combined with prompt caching.

Without this change, Docker Model Runner rejects the flags before llama.cpp is started.

[gemini-code-assist]

Caution

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[sourcery-ai]

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