Build an AI meal plan generator for home cooks with the following numbered features:
1. Onboarding quiz capturing goals (weight loss, muscle gain, budget, family size), diet type (omnivore, vegetarian, vegan, keto, halal, kosher, gluten free), allergies, cooking skill, and minutes available per meal.
2. A rule-based nutritional engine that translates goals into daily calorie and macro targets, then asks the AI to generate 7 days of breakfast, lunch, and dinner slots that respect every constraint.
3. A recipe database layer where each meal links to an ingredients list, steps, prep time, and nutrition data, with the AI only choosing and adapting recipes rather than inventing nutrition facts.
4. One-tap regenerate on any single slot (keep the rest of the week) with a reason picker such as too expensive, do not like it, or takes too long.
5. Automatic grocery list aggregation that merges duplicate ingredients across the week, groups them by supermarket aisle, and estimates total cost.
6. Pantry integration where users mark what they already have and the list and cost update instantly.
7. Leftover logic that schedules overlapping ingredients across consecutive days to reduce food waste.
8. Meal prep mode that bundles Sunday batch-cook instructions for the full week.