feat: end-to-end choice question support in assessment pipeline

- Data pathway: flow options through questions, answerKey in graph state
- Interviewer: format MULTIPLE_CHOICE with A/B/C/D options
- Grader: instant choice scoring (zero LLM), compare correctAnswer
- AssessmentView: render choice buttons vs textarea based on questionType
- Security: sanitizeStateForClient strips correctAnswer/judgment/answerKey
- Bank detection: check PUBLISHED items (not PUBLISHED bank status)
- Batch UI: select all / batch approve / batch reject on detail view

server/src/assessment/graph/nodes/interviewer.node.ts

@@ -33,8 +33,6 @@ export const interviewerNode = async (
 
   const currentQuestion = questions[currentQuestionIndex];
 
-  // If it's a follow-up, we add a prefix to the label later.
-  // If we've run out of questions and no follow-up requested, we shouldn't be here, but let's be safe.
   if (currentQuestionIndex >= questions.length) {
     return { shouldFollowUp: false };
   }
@@ -49,12 +47,10 @@ export const interviewerNode = async (
     state.feedbackHistory &&
     state.feedbackHistory.length > 0
   ) {
-    // Construct a follow-up prompt based on last feedback
     const lastFeedbackMsg =
       state.feedbackHistory[state.feedbackHistory.length - 1];
     const feedbackText = lastFeedbackMsg.content.toString();
 
-    // Extract the "Feedback: ..." part if possible, otherwise use whole text
     const feedbackMatch = feedbackText.match(
       /(?:Feedback|反馈|フィードバック): ([\s\S]*)/i,
     );
@@ -74,8 +70,22 @@ export const interviewerNode = async (
         : 'Based on the feedback above, please provide more specific details:';
 
     prompt = `${followUpLabel}\n\n${specificFeedback}\n\n${followUpInstruction}`;
+  } else if (currentQuestion.questionType === 'MULTIPLE_CHOICE' && currentQuestion.options?.length > 0) {
+    const label = isZh
+      ? `问题 ${currentQuestionIndex + 1}`
+      : isJa
+        ? `質問 ${currentQuestionIndex + 1}`
+        : `Question ${currentQuestionIndex + 1}`;
+
+    const optionsText = currentQuestion.options.join('\n');
+    const instruction = isZh
+      ? '请选择一个选项（输入字母 A/B/C/D）'
+      : isJa
+        ? '選択肢から1つ選んでください（A/B/C/Dを入力）'
+        : 'Please select one option (enter A, B, C, or D)';
+
+    prompt = `${label}: ${currentQuestion.questionText}\n\n${optionsText}\n\n${instruction}`;
   } else {
-    // Standard question presentation
     const label = isZh
       ? `问题 ${currentQuestionIndex + 1}`
       : isJa