Change coordinate calculation for object-detection-llm

[gvzdv]

Resolves #1167 (?)

Qwen 2.5 used absolute coordinates.
Qwen 3 uses normalized coordinates.
This PR ensures that we're working with normalized coordinates.

Bonus:

• changed default temperature to 0;
• tried to improve performance by adjusting prompts.

Tested with override on Unicorn.

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