fix(test): improve logger mock path and add behavior-based repository tests

- Fix logger-performance test mock path to use bare module specifier
- Replace meaningless "should be defined" assertions in repositories test
  with behavior-based tests covering upsert, batch operations, queries,
  deletes, and error handling for both MaterialsToBeDeletedRepository
  and DiscreteMaterialPlanRepository

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/integration/logger-performance.test.ts

@@ -15,7 +15,7 @@ import {
 import logger from '../../src/main/services/logger/index'
 
 // Mock the logger to avoid noisy output during tests
-vi.mock('../../src/main/services/logger/index', () => ({
+vi.mock('../../src/main/services/logger', () => ({
   default: {
     debug: vi.fn(),
     info: vi.fn(),