Enhanced the barcode scanner page with a search box and autocomplete suggestions for food items. Updated backend routes to support searching by both barcode and name, and added a new /query endpoint for AJAX search. Refactored step3 and step3_alt1 routes to handle both barcode and name inputs.
Introduces a new add_meal blueprint with routes and templates for scanning barcodes, adding new food items, and logging meals. Updates FoodItemForm and FoodLogForm validation, changes FoodLog.amount to float, and integrates the new workflow into the daily log UI. Refactors user routes and templates to support the new meal logging process.
