feat: 考核系统升级 P0+P1+P2 — 体验/题库/配置增强

P0 — 答题体验优化:
- 题序导航点：题目进度可视化，标记题目标记
- 标记回头检查: 点击🏷️按钮标记当前题，导航点变黄色
- 提交确认弹窗: 未答完时提交弹出确认对话框

P1 — 题库管理增强:
- QuestionBankItem 新增 tags 字段（多标签过滤）
- 新增 question_bank_templates 联表（题库跨模板复用）

P2 — 考试配置增强:
- AssessmentTemplate 新增字段:
  - attemptLimit (尝试次数限制)
  - scheduledStart/scheduledEnd (预约时段)
  - reviewMode (回顾模式: none/after_completion/per_question)
  - shuffleQuestions (每题随机排序)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/src/assessment/assessment.module.ts

@@ -9,6 +9,7 @@ import { AssessmentTemplate } from './entities/assessment-template.entity';
 import { AssessmentCertificate } from './entities/assessment-certificate.entity';
 import { QuestionBank } from './entities/question-bank.entity';
 import { QuestionBankItem } from './entities/question-bank-item.entity';
+import { QuestionBankTemplate } from './entities/question-bank-template.entity';
 import { KnowledgeBaseModule } from '../knowledge-base/knowledge-base.module';
 import { KnowledgeGroupModule } from '../knowledge-group/knowledge-group.module';
 import { ModelConfigModule } from '../model-config/model-config.module';
@@ -36,6 +37,7 @@ import { AuditLogService } from './services/audit-log.service';
       AssessmentCertificate,
       QuestionBank,
       QuestionBankItem,
+      QuestionBankTemplate,
       AuditLog,
     ]),
     forwardRef(() => KnowledgeBaseModule),