feat: enriched certificate with template name, dimension scores, question details + Modal UI

- generateCertificate: return templateName, questionDetails, dimensionScores
- Frontend: replace alert() with certificate Modal showing level, scores, dimensions, questions
- Status label: change from '已验证' to '合格'

server/src/assessment/assessment.service.ts

@@ -1500,6 +1500,13 @@ const initialState: Partial<EvaluationState> = {
     const level = this.determineLevel(session.finalScore || 0);
     const qrCode = `cert://${sessionId}-${Date.now()}`;
 
+    const questionDetails = (session.questions_json || []).map((q: any, i: number) => ({
+      index: i + 1,
+      questionText: q.questionText?.substring(0, 100) || '',
+      questionType: q.questionType || 'SHORT_ANSWER',
+      dimension: q.dimension || '',
+    }));
+
     const certificate = this.certificateRepository.create({
       userId,
       sessionId,
@@ -1512,7 +1519,13 @@ const initialState: Partial<EvaluationState> = {
       passed: (session as any).passed || false,
     });
 
-    return this.certificateRepository.save(certificate);
+    const saved = await this.certificateRepository.save(certificate);
+    return {
+      ...saved,
+      templateName: session.template?.name || session.templateJson?.name || '-',
+      userName: session.user?.displayName || session.user?.username || '',
+      questionDetails,
+    } as any;
   }
 
   private determineLevel(score: number): string {