feat(onboarding): add resumable module-tour progress field + API

Add nullable onboarding_tour_progress_json to users (migration 0173),
a Zod-validated progress shape, and extend POST /api/onboarding/tour to
accept a mid-tour resume checkpoint and clear it on replay. Surface the
resume point on GET /api/auth/me and register the contract in OpenAPI so
the native client mirrors it.

src/components/settings/__tests__/disable-coach-card.test.tsx

@@ -63,6 +63,7 @@ function buildUser(disableCoach: boolean): AuthUser {
     timezone: "Europe/Berlin",
     onboardingCompletedAt: null,
     onboardingTourCompleted: true,
+    onboardingTourProgress: null,
     avatarUrl: null,
     glucoseUnit: null,
     unitPreference: "metric",

src/components/settings/__tests__/modules-section.test.tsx

@@ -69,6 +69,7 @@ function buildUser(modules: AuthUser["modules"]): AuthUser {
     timezone: "Europe/Berlin",
     onboardingCompletedAt: null,
     onboardingTourCompleted: true,
+    onboardingTourProgress: null,
     avatarUrl: null,
     glucoseUnit: null,
     unitPreference: "metric",

src/components/settings/__tests__/time-format-select.test.tsx

@@ -41,6 +41,7 @@ function buildUser(timeFormat: TimeFormatPreference): AuthUser {
     timezone: "Europe/Berlin",
     onboardingCompletedAt: null,
     onboardingTourCompleted: true,
+    onboardingTourProgress: null,
     avatarUrl: null,
     glucoseUnit: null,
     unitPreference: "metric",

src/components/settings/__tests__/unit-preference-select.test.tsx

@@ -44,6 +44,7 @@ function buildUser(unitPreference: "metric" | "imperial"): AuthUser {
     timezone: "Europe/Berlin",
     onboardingCompletedAt: null,
     onboardingTourCompleted: true,
+    onboardingTourProgress: null,
     avatarUrl: null,
     glucoseUnit: null,
     unitPreference,