feat: add batch-cooking sessions (single "mega recipe" with dish sections)

New AI-generated batch-cooking flow: pick N dinners/lunches + servings,
get one unified recipe covering a full prep session — merged shopping
list, steps tagged per-dish (a step can advance several dishes at once,
e.g. a shared oven bake), and per-dish storage (fridge/freezer) + exact
day-of reheat/finishing instructions.

Schema: recipes.isBatchCook, recipeSteps.appliesTo (dish names), new
recipeBatchDishes table. Batch recipes are excluded from the normal
/recipes list and live under their own /batch-cooking section.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/(app)/recipes/page.tsx

@@ -54,6 +54,7 @@ export default async function RecipesPage({ searchParams }: { searchParams: Sear
 
   const where = and(
     eq(recipes.authorId, session.user.id),
+    eq(recipes.isBatchCook, false),
     query
       ? or(ilike(recipes.title, `%${query}%`), ilike(recipes.description, `%${query}%`))
       : undefined,