Recipe library + weekly meal plan

Build a personal recipe and meal-planning app.

Core features:
1. Save recipes (paste URL to auto-parse title, ingredients, steps)
2. Weekly plan: drag recipes onto days
3. Auto-generate shopping list combined by ingredient
4. Filter recipes by ingredients on hand
5. Family sharing

Data: recipes, ingredients, meal_plans, shopping_lists.
Must-haves: mobile-first, offline shopping list, dietary filters.