feat: Authors feature backend (and upgraded deprecated mods)

test/activity_usecases_test.go

@@ -39,7 +39,7 @@ func newActivityWorld(t *testing.T) *activityWorld {
 	w.users.users[1] = user.User{ID: 1, Username: "owner", IsVerified: true, Role: user.RoleOwner}
 	w.users.users[2] = user.User{ID: 2, Username: "admin", IsVerified: true, Role: user.RoleAdmin}
 	w.users.users[3] = user.User{ID: 3, Username: "marta", DisplayName: "Marta Alves", IsVerified: true, Role: "editor"}
-	w.list = useCases.NewListActivityUseCase(h.probe, w.users, w.articles, w.images, w.keys, h.clock, plainSites())
+	w.list = useCases.NewListActivityUseCase(h.probe, w.users, w.articles, w.images, w.keys, h.clock, plainSites(), plainAuthors())
 	w.summary = useCases.NewGetActivitySummaryUseCase(h.probe, h.clock)
 	w.export = useCases.NewExportActivityUseCase(h.probe, h.clock)
 	return w