feat: bearer auth, auto-sync events, test seed

- Add bearer plugin to BetterAuth for mobile auth
- Auto-sync birthday/anniversary events on client create/update
- Add /api/events/sync-all endpoint for bulk sync
- Add test user seed (test@test.com / test)
- Expose set-auth-token header in CORS

entrypoint.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+
+# Run seed (creates test user if not exists)
+echo "Running database seed..."
+bun run db:seed || echo "Seed skipped or failed (may already exist)"
+
+# Start the app
+echo "Starting API..."
+exec bun run src/index.ts