perf: Optimize API call patterns and resource usage across backend and LLM server#53

Draft

Copilot wants to merge 7 commits intomainfrom

copilot/improve-slow-code-efficiency

Commits on Dec 16, 2025

Initial plan
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Optimize backend API calls with concurrency controls and batch processing

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herin7
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Fix code review issues: correct splice usage and remove conflicting CORS headers

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herin7
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Update .gitignore to exclude Python cache files

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herin7
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Address code review feedback: improve comments, optimize file filtering, simplify splice

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herin7
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Use more explicit array length assignment instead of splice

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herin7
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Use slice for clearer array trimming intent

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herin7
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