refactor(reaction): 下线 comment app

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

oj/settings.py

@@ -54,7 +54,6 @@ LOCAL_APPS = [
     "options",
     "judge",
     "message",
-    "comment",
     "reaction",
     "tutorial",
     "ai",

oj/urls.py

@@ -17,8 +17,6 @@ urlpatterns = [
     path("api/", include("message.urls.oj")),
     path("api/", include("reaction.urls.oj")),
     path("api/admin/", include("reaction.urls.admin")),
-    path("api/", include("comment.urls.oj")),
-    path("api/admin/", include("comment.urls.admin")),
     path("api/", include("tutorial.urls.tutorial")),
     path("api/admin/", include("tutorial.urls.admin")),
     path("api/", include("ai.urls.oj")),