feat: recipe detail + weekly shopping list (PRD §5.1, §5.4)

Recipe detail
- Seed catalog of 33 italian ingredients with macros, allergens, avg price.
- Each seed recipe now declares its RecipeIngredient links (qty + unit).
- /recipes/[id] page: editorial layout with prep meta, ingredients list,
  macros block, preparation, chef's note. Plan-week meal names linkable.

Shopping list
- GET /me/shopping-list aggregates RecipeIngredient quantities of the
  ACTIVE plan, grouped by ingredient category, sorted alphabetically.
- /shopping page: total items, estimated cost, per-category checklist
  with check-off persisted in localStorage per plan id.
- Home gets a "Spesa" nav item; /plan links the list when a plan exists.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/db/prisma/seed.ts

@@ -1,21 +1,102 @@
 import { PrismaClient } from '@prisma/client';
 
+import { SEED_INGREDIENTS } from './seed-ingredients.js';
 import { SEED_RECIPES } from './seed-recipes.js';
 
 const prisma = new PrismaClient();
 
 async function main(): Promise<void> {
-  // Idempotente: createMany con skipDuplicates su nome (unique implicit nope —
-  // usiamo upsert per ognuna).
-  let inserted = 0;
-  for (const r of SEED_RECIPES) {
-    const existing = await prisma.recipe.findFirst({ where: { name: r.name } });
+  // 1. Ingredienti — upsert sul nome (unique).
+  let ingredientsInserted = 0;
+  for (const i of SEED_INGREDIENTS) {
+    const existing = await prisma.ingredient.findUnique({ where: { name: i.name } });
     if (existing) continue;
-    await prisma.recipe.create({ data: r });
-    inserted++;
+    await prisma.ingredient.create({
+      data: {
+        name: i.name,
+        category: i.category,
+        defaultUnit: i.defaultUnit,
+        kcalPer100g: i.kcalPer100g,
+        proteinPer100g: i.proteinPer100g,
+        fatPer100g: i.fatPer100g,
+        netCarbPer100g: i.netCarbPer100g,
+        exclusionGroups: i.exclusionGroups,
+        priceAvgEur: i.priceAvgEur ?? null,
+      },
+    });
+    ingredientsInserted++;
   }
+
+  const allIngredients = await prisma.ingredient.findMany({ select: { id: true, name: true } });
+  const ingredientByName = new Map(allIngredients.map((i) => [i.name, i.id]));
+
+  // 2. Ricette — `Recipe.name` non è unique nel modello, ma il seed garantisce
+  // unicità per costruzione. Idempotente: se esiste, aggiorniamo i campi
+  // anagrafici e ricreiamo i RecipeIngredient (così editare il seed propaga).
+  let recipesInserted = 0;
+  let linksCreated = 0;
+  for (const r of SEED_RECIPES) {
+    let recipe = await prisma.recipe.findFirst({ where: { name: r.name } });
+    if (!recipe) {
+      recipe = await prisma.recipe.create({
+        data: {
+          name: r.name,
+          category: r.category,
+          description: r.description,
+          prepMinutes: r.prepMinutes,
+          difficulty: r.difficulty,
+          kcal: r.kcal,
+          proteinG: r.proteinG,
+          fatG: r.fatG,
+          netCarbG: r.netCarbG,
+          phases: r.phases,
+          notesChef: r.notesChef ?? null,
+        },
+      });
+      recipesInserted++;
+    } else {
+      recipe = await prisma.recipe.update({
+        where: { id: recipe.id },
+        data: {
+          category: r.category,
+          description: r.description,
+          prepMinutes: r.prepMinutes,
+          difficulty: r.difficulty,
+          kcal: r.kcal,
+          proteinG: r.proteinG,
+          fatG: r.fatG,
+          netCarbG: r.netCarbG,
+          phases: r.phases,
+          notesChef: r.notesChef ?? null,
+        },
+      });
+    }
+
+    await prisma.recipeIngredient.deleteMany({ where: { recipeId: recipe.id } });
+    for (const ing of r.ingredients) {
+      const ingredientId = ingredientByName.get(ing.name);
+      if (!ingredientId) {
+        // eslint-disable-next-line no-console
+        console.warn(`[seed] ricetta "${r.name}": ingrediente "${ing.name}" non trovato`);
+        continue;
+      }
+      await prisma.recipeIngredient.create({
+        data: {
+          recipeId: recipe.id,
+          ingredientId,
+          quantity: ing.quantity,
+          unit: ing.unit,
+        },
+      });
+      linksCreated++;
+    }
+  }
+
   // eslint-disable-next-line no-console
-  console.info(`[seed] recipes inserted: ${inserted} (catalog total ${SEED_RECIPES.length})`);
+  console.info(
+    `[seed] ingredients +${ingredientsInserted} (catalog ${SEED_INGREDIENTS.length}), ` +
+      `recipes +${recipesInserted} (catalog ${SEED_RECIPES.length}), recipe-ingredient links: ${linksCreated}`,
+  );
 }
 
 main()