feat(onboarding): add User.onboardingGoals for goal persistence

The goals step let the user toggle goal slugs but both Skip and Next
discarded the selection — the picker was decorative. Add the
onboarding_goals text array the earlier dead code already referenced so
the selection can persist and seed dashboard tiles + reminder
suggestions. Not a clinical target store; targets stay fully derived
from height/age/gender in /api/insights/targets. Empty array = no
preference; purely-additive migration with an empty-array default, no
backfill.

prisma/migrations/0163_v1171_onboarding_goals/migration.sql

@@ -0,0 +1,15 @@
+-- v1.17.1 — persist the onboarding goal selection.
+--
+-- The GoalsChipPicker step let the user toggle goal slugs, but both
+-- Skip and Next discarded the selection — the picker was decorative.
+-- This adds the `onboarding_goals` text array the dead code already
+-- referenced, so the selection can seed dashboard tile pinning and
+-- reminder suggestions.
+--
+-- Purely-additive: one new column on `users`, NOT NULL with a `'{}'`
+-- (empty array) default, so every existing row keeps "no preference"
+-- without a backfill pass. The column is a personalization seed, not a
+-- clinical target store.
+
+ALTER TABLE "users"
+  ADD COLUMN "onboarding_goals" TEXT[] NOT NULL DEFAULT ARRAY[]::TEXT[];

prisma/schema.prisma

@@ -236,6 +236,15 @@ model User {
   //             round-trip — the column stays at 4 for completed users)
   // Null = legacy pre-W14b user; the wizard treats null as 0 on mount.
   onboardingStep          Int       @default(0) @map("onboarding_step")
+  // v1.17.1 — goal slugs chosen during onboarding (GoalsChipPicker).
+  // Seeds dashboard tile pinning + reminder suggestions; NOT a clinical
+  // target store (targets are fully derived from height/age/gender +
+  // clinical refs in /api/insights/targets). Empty [] = skipped / no
+  // preference. The slug set is the closed enum
+  // `ONBOARDING_GOAL_SLUGS` in src/lib/onboarding/goals.ts; a String[]
+  // (not a relation) mirrors `insightsExcludeMetrics` precedent — the
+  // set is small and fixed, never queried relationally.
+  onboardingGoals         String[]  @default([]) @map("onboarding_goals")
   // v1.4.15 Phase B5: tracks whether the user has finished (or
   // explicitly dismissed) the spotlight tour that overlays the
   // dashboard on first arrival. Distinct from the wizard at