feat: preferences, exclusion-aware planner, /onboarding (PRD §5.1, §3)

Preferences (PRD §5.1)
- @ketopath/shared: zod schemas + EXCLUSION_GROUPS, CUISINE_TAGS,
  COOKING_TIMES, FASTING_PROTOCOL_VALUES
- apps/api: GET/PATCH /me/preferences (exclusions, cuisinePreferences,
  cookingTime, fastingProtocol)
- apps/web: PreferencesForm chip-based + PreferencesSection wired into
  /profile so existing users can edit
- Plan generation now aggregates Ingredient.exclusionGroups → Recipe
  exclusionTags so matchMeals filters out excluded recipes

Onboarding (PRD §3)
- /onboarding multi-step (profile → preferences → done) with smart-jump:
  starts at the first incomplete step
- ProfileForm gains optional onSaved/saveLabel for reuse outside /profile
- Redirect chain updated: /welcome accept → /onboarding (was /profile);
  /plan, /tracking, /shopping redirect missing profiles to /onboarding
- /profile remains the editing surface for returning users

i18n
- New Onboarding + Preferences namespaces (it)

Smoke tested end-to-end: selected fish exclusion, regenerated the plan,
verified Salmone/Branzino/Tonno are filtered out and unaffected recipes
(Frittata, Pollo, Mandorle, Polpette) remain.

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

apps/api/src/modules/plan/plan.routes.ts

@@ -47,23 +47,32 @@ export const planRoutes: FastifyPluginAsync = async (fastify) => {
         fatG: true,
         netCarbG: true,
         phases: true,
+        ingredients: {
+          select: { ingredient: { select: { exclusionGroups: true } } },
+        },
       },
     });
     if (recipes.length === 0) {
       return reply.code(409).send({ error: 'recipe_catalog_empty' });
     }
 
-    const candidates: RecipeCandidate[] = recipes.map((r) => ({
-      id: r.id,
-      name: r.name,
-      category: r.category,
-      kcal: r.kcal,
-      proteinG: r.proteinG,
-      fatG: r.fatG,
-      netCarbG: r.netCarbG,
-      exclusionTags: [],
-      phases: r.phases.filter((p): p is 1 | 2 | 3 => p === 1 || p === 2 || p === 3),
-    }));
+    const candidates: RecipeCandidate[] = recipes.map((r) => {
+      const tags = new Set<string>();
+      for (const ri of r.ingredients) {
+        for (const g of ri.ingredient.exclusionGroups) tags.add(g);
+      }
+      return {
+        id: r.id,
+        name: r.name,
+        category: r.category,
+        kcal: r.kcal,
+        proteinG: r.proteinG,
+        fatG: r.fatG,
+        netCarbG: r.netCarbG,
+        exclusionTags: Array.from(tags),
+        phases: r.phases.filter((p): p is 1 | 2 | 3 => p === 1 || p === 2 || p === 3),
+      };
+    });
 
     const weightCurrentKg = Number(profile.weightCurrentKg);
     const bmr = calculateBmr({