[US-023] Live Now feed #36
Description
Epic: EP-04 — End User Discovery \nPriority: Must Have (M) \nStory Points: 5 \nSprint: Sprint 2\n\n### User Story\nAs an end user, I want to see a 'Live Now' feed so I can join ongoing streams immediately.\n\n### Acceptance Criteria\n- [ ] Dedicated 'Live Now' section/tab on home screen\n- [ ] Only shows stores with is_live = true\n- [ ] Updates in real-time as stores go live/offline\n- [ ] Sorted by follower count (most popular first)\n- [ ] Store card shows platform links to join directly\n\n### Technical Notes\n- GET /api/stores/?is_live=true&ordering=-follower_count\n- WebSocket channel for real-time live status updates\n- Cache invalidated when is_live changes