feat(diet): lagg till nordisk/carnivore/paleo + LCHF som matvanor med mjuk rankning

- DIET_PATTERNS: +nordic, +carnivore, +paleo (migration 0029). Ingen separat
  "lchf" - LCHF tacks av befintliga "low_carb" for att undvika dubblett med
  keto/low_carb. UI visar low_carb med etiketten "LCHF".
- Mobil onboarding + profil: 9 rena val (allatare..carnivore), 12 sprak.
- recommendation-engine: ny mjuk dietAffinity-poangterm (0-1, neutral 0.5).
  Rankar recept mot matvanan - ALDRIG hart filter (uteslutande matvanor,
  religion, allergener hanteras redan deterministiskt i sakerhetsfiltret).
  low_carb/keto: lag kolhydrat. carnivore: hog protein + lag kolhydrat.
  paleo: glutenfri/laktosfri-proxyer. nordic: svenskt/nordiskt kok + sasong.
- 6 nya tester (35 grona). Full typecheck 20/20 + mobil gron.

apps/api/src/routes/recommendations.ts

@@ -328,6 +328,7 @@ export async function recommendationRoutes(app: FastifyInstance) {
       activeHolidayTags,
       isWeekday: today.getUTCDay() >= 1 && today.getUTCDay() <= 4,
       favoriteCuisines: myPrefs?.favoriteCuisines ?? [],
+      dietPattern: myPrefs?.dietPattern ?? undefined,
       cravingTags: craving?.tags,
       cravingCuisine: craving?.cuisine,
       cravingMaxKcal: craving?.maxKcal,