Initial commit: AuraK人才测评系统基础框架

## 已实现功能
- 题库管理后端API完整实现
- 模板管理页面(Settings-测评模板)
- 评估统计页面
- 人才测评页面(AssessmentView)
- QuestionBank前端服务层

## 技术栈
- 后端: Node.js + NestJS + TypeORM
- 前端: React + TypeScript
- 容器化: Docker Compose

## 已知待完善
- 题库列表页缺少删除按钮
- 题库详情页未实现(题目管理/AI生成/审核)

server/src/knowledge-group/knowledge-group.controller.ts

@@ -43,6 +43,7 @@ export class KnowledgeGroupController {
   @Post()
   @Roles(UserRole.TENANT_ADMIN, UserRole.SUPER_ADMIN)
   async create(@Body() createGroupDto: CreateGroupDto, @Request() req) {
+    console.log('[KnowledgeGroup] create called, user:', req.user);
     return await this.groupService.create(
       req.user.id,
       req.user.tenantId,

server/src/knowledge-group/knowledge-group.service.ts

@@ -62,11 +62,19 @@ export class KnowledgeGroupService {
     userId: string,
     tenantId: string,
   ): Promise<GroupWithFileCount[]> {
+    console.log('[KnowledgeGroup findAll] userId:', userId, 'tenantId:', tenantId);
     // Return all groups for the tenant with file counts
-    const groups = await this.groupRepository
+    const queryBuilder = this.groupRepository
       .createQueryBuilder('group')
-      .leftJoin('group.knowledgeBases', 'kb')
-      .where('group.tenantId = :tenantId', { tenantId })
+      .leftJoin('group.knowledgeBases', 'kb');
+
+    if (tenantId === null) {
+      queryBuilder.where('group.tenantId IS NULL');
+    } else {
+      queryBuilder.where('group.tenantId = :tenantId', { tenantId });
+    }
+
+    const groups = await queryBuilder
       .addSelect('COUNT(kb.id)', 'fileCount')
       .groupBy('group.id')
       .orderBy('group.createdAt', 'ASC')
@@ -139,13 +147,16 @@ export class KnowledgeGroupService {
     tenantId: string,
     createGroupDto: CreateGroupDto,
   ): Promise<KnowledgeGroup> {
+    console.log('[KnowledgeGroup create] userId:', userId, 'tenantId:', tenantId);
     const group = this.groupRepository.create({
       ...createGroupDto,
       parentId: createGroupDto.parentId ?? null,
       tenantId,
     });
 
-    return await this.groupRepository.save(group);
+    const saved = await this.groupRepository.save(group);
+    console.log('[KnowledgeGroup create] saved group tenantId:', saved.tenantId);
+    return saved;
   }
 
   async update(