fix: relative imports for examples in mesa-llm

[EloZiko]

Updated the three examples (negotiation, epstein_civil_violence, and sugarscrap_g1mt) to use relative imports instead of absolute imports because of ModuleNotFoundError when running solara from the example directory as described in the README

Maybe it's better to change the README ?

Tested locally by running solara run app.py from the example directory

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[wang-boyu]

Thanks for reporting this. However, I can't reproduce this with the current codebase. Could you please share your exact steps to get the import errors? What I did was

1. create a fresh virtual environment and activate it
2. install mesa-llm: pip install -e .
3. go to an example, e.g., cd examples/epstein_civil_violence
4. run the model: solara run app.py and it runs without any issues