feat: expand platform management, admin controls, and learning workflows

backend/tests/problem_workspace_service_test.cc

@@ -42,7 +42,21 @@ TEST_CASE("problem workspace service drafts and solution jobs") {
   REQUIRE(latest->id == job_id);
   REQUIRE(latest->status == "queued");
   REQUIRE(latest->max_solutions == 3);
+  REQUIRE(latest->problem_title.empty());
+
+  const auto recent = svc.ListRecentSolutionJobs(10);
+  REQUIRE(recent.size() == 1);
+  REQUIRE(recent.front().id == job_id);
+  REQUIRE(recent.front().problem_id == pid);
+  REQUIRE(!recent.front().problem_title.empty());
 
   const auto solutions = svc.ListSolutions(pid);
   REQUIRE(solutions.empty());
+
+  REQUIRE(svc.CountProblemsWithoutSolutions() >= 1);
+  const auto missing_all = svc.ListProblemIdsWithoutSolutions(10, false);
+  REQUIRE(!missing_all.empty());
+  const auto missing_skip_busy = svc.ListProblemIdsWithoutSolutions(10, true);
+  REQUIRE(!missing_skip_busy.empty());
+  REQUIRE(missing_skip_busy.size() < missing_all.size());
 }