🧹 Extract magic number 30 in balancer/core.py

[alfieprojectsdev]

• 🎯 What: Extracted the magic number 30 used in needed_qty calculation to a module-level constant TARGET_STOCK_DAYS. Also moved CRITICAL_LOW_DAYS and BASE_OVERSTOCK_DAYS to the module level and updated calculate_dynamic_threshold to use BASE_OVERSTOCK_DAYS as the default value. Added .gitignore to prevent committing __pycache__ files.
• 💡 Why: Improves code readability and maintainability by clarifying the intent of the number 30 (target stock days) and centralizing configuration constants. Moving constants to the module level makes them easier to find and modify. Cleaning up __pycache__ ensures a clean repository.
• ✅ Verification: Ran pytest balancer/ and all tests passed. Manually verified the changes in balancer/core.py.
• ✨ Result: The code is cleaner, more maintainable, and the repository is free of binary artifacts.

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PR created automatically by Jules for task 10200281598044358999 started by @alfieprojectsdev

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