P0-1/P0-2/P1-1: dimensions form + E2E tests + PDF export

P0-1 Backend: dimensions column on template entity + validation
P0-1 Frontend: dimensions edit UI in TemplateManager
P0-2: routeAfterGrading unit tests (10 cases), service spec fix + certificate tests, jest-e2e.json
P1-1: proper PDF generation with embedded CJK font via pdf-lib low-level API

server/src/assessment/services/template.service.ts

@@ -2,6 +2,7 @@ import {
   Injectable,
   NotFoundException,
   ForbiddenException,
+  BadRequestException,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
@@ -18,11 +19,33 @@ export class TemplateService {
     private readonly tenantService: TenantService,
   ) {}
 
+  private validateRequiredFields(data: {
+    linkedGroupIds?: string[];
+    dimensions?: Array<{ name: string; label?: string; weight?: number }>;
+  }) {
+    if (data.linkedGroupIds !== undefined) {
+      if (!Array.isArray(data.linkedGroupIds) || data.linkedGroupIds.length === 0) {
+        throw new BadRequestException('At least one knowledge group must be linked');
+      }
+    }
+    if (data.dimensions !== undefined) {
+      if (!Array.isArray(data.dimensions) || data.dimensions.length === 0) {
+        throw new BadRequestException('At least one dimension must be defined');
+      }
+      for (const d of data.dimensions) {
+        if (!d.name) {
+          throw new BadRequestException('Each dimension must have a name');
+        }
+      }
+    }
+  }
+
   async create(
     createDto: CreateTemplateDto,
     userId: string,
     tenantId: string,
   ): Promise<AssessmentTemplate> {
+    this.validateRequiredFields(createDto);
     const { ...data } = createDto;
     const template = this.templateRepository.create({
       ...data,
@@ -76,6 +99,8 @@ export class TemplateService {
     tenantId: string,
   ): Promise<AssessmentTemplate> {
     const template = await this.findOne(id, userId, tenantId);
+    const merged = { ...template, ...updateDto };
+    this.validateRequiredFields(merged);
     Object.assign(template, updateDto);
     return this.templateRepository.save(template);
   }