Refactor order processing to use product mapping and quantities

[seer-by-sentry]

Fixes ANDROID-4Q. The issue was that: Flask backend's process_order function attempts Inventory[numeric_id], but Inventory uses string keys, causing KeyError and 500 response.

• Added a product mapping to translate product IDs to names.
• Modified process_order to use the product mapping and quantities from the cart.
• Updated inventory management to use product names instead of IDs.
• Improved logging to include the quantity purchased and remaining stock.

This fix was generated by Seer in Sentry, triggered by [email protected]. 👁️ Run ID: 194986

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