feat: §6 Gruppo B residuo — pannello macros, esclusioni granulari, achievement

- Plan: pannello macros laterale "oggi" con consumati/pianificati vs target (kcal/P/F/C). Sticky su lg, in-flow su mobile. Profile/derived ora include kcalTarget e i macro target (BMR aggiustato per condizioni e diet history).
- Preferenze: nuova sezione "Ingredienti specifici da evitare" con ricerca debounced sul catalogo (cap 50). Schema Preferences.bannedIngredientIds + matchmaking che scarta ricette contenenti ingredient bandito (test unit).
- Achievement: tabella Achievement (userId+key unique), 4 traguardi iniziali (first_weigh_in, first_plan, first_fast_complete, ten_meals_consumed). Service idempotente eval+persist agganciato a 4 trigger (weight POST, plan POST, fast PATCH→COMPLETED, slot consumed). Push notification best-effort all'unlock. Pannello badge nel profilo.

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

packages/db/prisma/migrations/20260506154003_add_achievements/migration.sql

@@ -0,0 +1,18 @@
+-- CreateTable
+CREATE TABLE "achievements" (
+    "id" TEXT NOT NULL,
+    "user_id" TEXT NOT NULL,
+    "key" TEXT NOT NULL,
+    "unlocked_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "achievements_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "achievements_user_id_idx" ON "achievements"("user_id");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "achievements_user_id_key_key" ON "achievements"("user_id", "key");
+
+-- AddForeignKey
+ALTER TABLE "achievements" ADD CONSTRAINT "achievements_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;