fix: code review — 7 issues resolved

(C1) Add dimensionScores/radarData/passed columns to AssessmentSession
(C2) Mock DataSource in service.spec.ts + app.e2e-spec.ts
(C3) Mock AuditLogService in controller.spec.ts
(C4) Rewrite deleteSession tests for dataSource.transaction
(I1) batchDeleteSessions uses transaction with certificate cleanup
(I2) extractDimensionScores reads from session property
(I3/I5) PDF generator supports multi-page + newline splitting
(I4) findOne inside transaction uses deleteCondition

server/src/assessment/assessment.controller.spec.ts

@@ -6,6 +6,7 @@ import { TenantService } from '../tenant/tenant.service';
 import { UserService } from '../user/user.service';
 import { CombinedAuthGuard } from '../auth/combined-auth.guard';
 import { ExportService } from './services/export.service';
+import { AuditLogService } from './services/audit-log.service';
 
 describe('AssessmentController', () => {
   let controller: AssessmentController;
@@ -27,6 +28,7 @@ describe('AssessmentController', () => {
         { provide: UserService, useFactory: mockService },
         { provide: TenantService, useFactory: mockService },
         { provide: ExportService, useFactory: mockService },
+        { provide: AuditLogService, useFactory: () => ({ log: jest.fn() }) },
         { provide: Reflector, useFactory: mockReflector },
         { provide: CombinedAuthGuard, useFactory: mockGuard },
       ],