Add DRF API app and real-time draft management UI

- Created new `api` Django app with serializers, viewsets, and routers
  to expose draft sessions, participants, and movie data.
- Registered `api` app in settings and updated root URL configuration.
- Extended WebSocket consumers with `inform.draft_status` /
  `request.draft_status` to allow fetching current draft state.
- Updated `DraftSession` and related models to support reverse lookups
  for draft picks.
- Enhanced draft state manager to include `draft_order` in summaries.
- Added React WebSocket context provider, connection status component,
  and new admin/participant panels with phase and participant tracking.
- Updated SCSS for participant lists, phase indicators, and status badges.
- Modified Django templates to mount new React roots for admin and
  participant views.
- Updated Webpack dev server config to proxy WebSocket connections.

draft/models.py

@@ -50,7 +50,7 @@ class DraftSessionParticipant(Model):
 
 
 class DraftPick(Model):
-    draft = ForeignKey(DraftSession, on_delete=CASCADE)
+    draft = ForeignKey(DraftSession, on_delete=CASCADE, related_name="draft_picks")
     movie = ForeignKey(Movie, on_delete=CASCADE)
     winner = ForeignKey(User, on_delete=CASCADE)
     bid_amount = IntegerField()