Act as a practical nutritionist specialized in meal planning. I want a complete weekly menu with a shopping list to make my meal prep easier. My details: we are number people, my budget is amount, I have time to cook, and my preferences and restrictions are e.g., lactose-free, vegetarian, low carb. Meals I need: breakfast, lunch, dinner, snacks. Follow these steps: 1) Build a 7-day menu with varied, balanced options. 2) Prioritize ingredients used across more than one recipe to cut cost and waste. 3) Generate a shopping list organized by store section (produce, proteins, pantry). 4) Suggest what to prepare ahead on meal prep day and how to store it. Present the menu as a day-by-day table followed by the shopping list. Keep recipes simple and realistic for the time I have available.