feat(dares): ship the dares loop to mobile

Completes the half-built dares feature: send a dare, respond, report done,
confirm, and get a push notification on every transition.

Backend (apps/api):
- New `dares` domain with couple-shared premium entitlement, a free weekly
  send allowance, and server-enforced actor/state rules on every transition.
- `submitted` status so the recipient reports completion and the sender
  confirms, rather than the sender guessing.
- Notifications ride the existing operations outbox via a trigger on
  `sent_dares`. Push copy is generic; store compliance forbids dare text in a
  preview and a test asserts no payload leaks it.
- Worker expiry sweep now covers `pending` as well as `active`/`submitted`;
  an invitation nobody opened previously stayed open forever.

Fixes two latent defects:
- Deleting any dare that had been sent aborted with a check violation, because
  `dare_id` is ON DELETE SET NULL while `sent_dares_dare_or_custom_check`
  required it. Dare text is now snapshotted at send time, which also keeps a
  couple's history stable across catalogue edits.
- The free send allowance was raceable: concurrent requests all read the same
  count and every one succeeded. The count and insert are now serialized on
  the sender's profile row.

Also ports `content_status` review metadata to the API catalogue, which had no
store-safety gating at all, and mirrors the review decision already enforced on
the legacy catalogue.

Mobile: dares screen (active/send/history), send sheet with duration presets,
home tile badging incoming dares, paywall on both proactive and 402 paths.

Verified: lint, typecheck, 379 unit tests, build, 71 integration tests against
local PostgreSQL.

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

apps/api/src/domains/profile-settings/repository.ts

@@ -19,6 +19,7 @@ interface PreferencesRow extends QueryResultRow {
   weekly_summary_enabled: boolean;
   unpaired_reminders_enabled: boolean;
   catchup_reminders_enabled: boolean;
+  dares_enabled: boolean;
   created_at: Date;
   updated_at: Date;
 }
@@ -64,6 +65,7 @@ function toPreferences(row: PreferencesRow): NotificationPreferences {
     weekly_summary_enabled: row.weekly_summary_enabled,
     unpaired_reminders_enabled: row.unpaired_reminders_enabled,
     catchup_reminders_enabled: row.catchup_reminders_enabled,
+    dares_enabled: row.dares_enabled,
     created_at: row.created_at.toISOString(),
     updated_at: row.updated_at.toISOString(),
   };