feat(onboarding): skippable avatar with first-match prompt and usage-reason pack picks

Lets new users skip the onboarding avatar step and instead defers the ask
to a lightweight, dismissible prompt shown once after the couple's first
match. Also personalizes the home screen's first pack recommendation using
the usage_reason already collected during onboarding, which now round-trips
through GET /v1/me.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/api/src/db/repository.ts

@@ -32,6 +32,7 @@ function toProfile(row: ProfileRow): MobileCompatibleProfile {
     is_premium: row.isPremium,
     couple_id: row.coupleId,
     gender: row.gender,
+    usage_reason: row.usageReason,
     show_explicit_content: row.showExplicitContent,
     max_intensity: row.maxIntensity as 1 | 2 | 3 | 4 | 5,
     created_at: row.createdAt.toISOString(),