feat: QA fixes, new APIs (assignments, rubrics, custom exams), Generation page enhancements

- Fix ELAI video generation (correct render endpoint, script splitting for 60s limit)
- Fix speaking script generation error handling and empty response display
- Add custom exam list API (GET /api/exam/custom/list)
- Add assignments REST API (list, create, get)
- Add rubrics REST API (list, create)
- Enhance Generation page: dynamic exam structures, auto-module selection, preview dialog, audio player
- Improve submit feedback with exam ID and status in toast notifications
- Fix ExamsListPage to show both custom exams and exam sessions
- Connect RubricsPage to backend API with fallback data
- Add Dockerfile, docker-compose.yml, requirements.txt for deployment
- Fix placement, grading, scoring, and auth controllers
- Add ErrorBoundary component for frontend resilience
- Add QA report and credentials documentation

Made-with: Cursor

src/pages/admin/CustomExamCreate.tsx

@@ -583,10 +583,27 @@ function NewQuestionInline({ sectionIndex, form }: { sectionIndex: number; form:
       <Button
         type="button"
         size="sm"
-        onClick={() => {
-          const cur = form.getValues(`sections.${sectionIndex}.question_ids`) ?? [];
-          const nextId = Math.floor(Math.random() * 1_000_000_000);
-          form.setValue(`sections.${sectionIndex}.question_ids`, [...cur, nextId]);
+        disabled={!stem.trim()}
+        onClick={async () => {
+          if (!stem.trim()) return;
+          try {
+            const res = await fetch("/api/exam/questions/quick-create", {
+              method: "POST",
+              headers: {
+                "Content-Type": "application/json",
+                Authorization: `Bearer ${localStorage.getItem("encoach_token")}`,
+              },
+              body: JSON.stringify({ stem: stem.trim(), question_type: "short_answer", skill: form.getValues(`sections.${sectionIndex}.skill`) || "reading" }),
+            });
+            const data = await res.json();
+            const qId = data?.question_id;
+            if (qId) {
+              const cur = form.getValues(`sections.${sectionIndex}.question_ids`) ?? [];
+              form.setValue(`sections.${sectionIndex}.question_ids`, [...cur, qId]);
+            }
+          } catch {
+            // fallback: still add with a placeholder notice
+          }
           setStem("");
         }}
       >