feat: propagate api_base property for local LLM support

[ahmednabiled]

Description

This PR propagates api_base across the Mesa-LLM stack so users can configure local or self-hosted LLM endpoints (e.g., remote Ollama, vLLM, LM Studio) from application-level APIs.

Previously, api_base was supported in ModuleLLM but not consistently exposed through higher-level abstractions such as LLMAgent and memory modules, which made custom endpoint configuration incomplete in end-to-end usage.

This PR also removes hardcoded model usage in example memory initialization paths so summarization uses the configured llm_model.

Changes

• Propagate api_base through LLMAgent, Memory, STLTMemory, EpisodicMemory, and LongTermMemory.
• Forward api_base from top-level abstractions into ModuleLLM.
• Update examples to pass api_base from app.py → model.py → agents.py.
• Update docs for ModuleLLM, LLMAgent, and Memory with api_base usage examples.
• Remove deprecated api_key references from documentation.

Checklist

• I have read the CONTRIBUTING document.
• My code follows project style guidelines.
• I added/updated tests for new behavior.
• I ran existing tests and all passed.
• I updated documentation.

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[IlamaranMagesh]

This seems related to the earlier discussion in #172, sharing it here for context.

[ahmednabiled]

@jackiekazil @colinfrisch @IlamaranMagesh I'd appreciate any feedback on these changes. Are they relevant, good, or bad? I did this because when I first ran the examples, it was a bit confusing trying to run them using local models. This was my starting point.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.78%. Comparing base (8fe8992) to head (f94b6f2).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   90.67%   90.78%   +0.10%     
==========================================
  Files          19       19              
  Lines        1555     1573      +18     
==========================================
+ Hits         1410     1428      +18     
  Misses        145      145              

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[wang-boyu]

Thanks for the improvement. I've moved the new api_base parameter after all previous parameters to make the API backward compatible. Could you pull my changes and verify that it's still working for you?