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/constants.py

@@ -5,10 +5,11 @@ class DraftMessage:
     INFORM_PHASE_CHANGE = "inform.phase.change"
     CONFIRM_PHASE_CHANGE = "confirm.phase.change"
     INFORM_PHASE = "inform.phase"
+    INFORM_DRAFT_STATUS = "inform.draft_status"
 
     # Client
     REQUEST_PHASE_CHANGE = "request.phase.change"
-    REQUEST_INFORM_STATUS = "request.inform.status"
+    REQUEST_DRAFT_STATUS = "request.draft_status"
 
     # Waiting Phase
     ## Server