feat: complete realtime challenge matchmaking

backend/contest/urls.py

@@ -3,8 +3,11 @@ from django.urls import path
 from .views import (
     AttemptStartView,
     AttemptSubmitView,
+    ChallengeCreateView,
+    ChallengeJoinView,
     ContestListView,
     LeaderboardView,
+    MatchCancelView,
     MatchmakingView,
     MatchStateView,
     MathGameCatalogView,
@@ -16,11 +19,18 @@ from .views import (
 
 urlpatterns = [
     path("", ContestListView.as_view(), name="contest-list"),
+    path("challenges/join/", ChallengeJoinView.as_view(), name="challenge-join"),
+    path("matches/<uuid:match_id>/", MatchStateView.as_view(), name="match-state"),
+    path("matches/<uuid:match_id>/cancel/", MatchCancelView.as_view(), name="match-cancel"),
     path("<slug:slug>/start/", AttemptStartView.as_view(), name="attempt-start"),
     path("<slug:slug>/matchmaking/", MatchmakingView.as_view(), name="matchmaking"),
+    path(
+        "<slug:slug>/challenges/",
+        ChallengeCreateView.as_view(),
+        name="challenge-create",
+    ),
     path("<slug:slug>/leaderboard/", LeaderboardView.as_view(), name="leaderboard"),
     path("attempts/<uuid:attempt_id>/submit/", AttemptSubmitView.as_view(), name="attempt-submit"),
-    path("matches/<uuid:match_id>/", MatchStateView.as_view(), name="match-state"),
     path("games/", MathGameCatalogView.as_view(), name="math-game-catalog"),
     path("games/history/", MathGameHistoryView.as_view(), name="math-game-history"),
     path("games/<str:kind>/start/", MathGameStartView.as_view(), name="math-game-start"),