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

Dockerfile

@@ -14,5 +14,5 @@ COPY . .
 ENV NODE_ENV=production
 EXPOSE 3000
 
-USER bun
-CMD ["bun", "run", "src/index.ts"]
+RUN chmod +x entrypoint.sh
+CMD ["./entrypoint.sh"]