Refactor: Rename calculate_bmi to calculate_doi in balancer/core.py

[alfieprojectsdev]

• 🎯 What: Renamed calculate_bmi to calculate_doi in balancer/core.py.
• 💡 Why: To improve clarity, as the function calculates Days of Inventory (DOI), not Body Mass Index (BMI).
• ✅ Verification:
  • Ran pytest balancer/ to ensure no regressions.
  • Added a new test test_calculate_doi in balancer/test_balancer.py to explicitly test the renamed function.
  • Verified that calculate_bmi is no longer used in the codebase.
  • Added .gitignore to prevent tracking of build artifacts.
• ✨ Result: Improved code readability and maintainability.

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PR created automatically by Jules for task 14312894930301504704 started by @alfieprojectsdev

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