fix(jest): Use relative path for setupFiles in Jest 30

Jest 30 no longer resolves <rootDir>/setupTests.js correctly, causing
CI failures on the release branch. Use ./setupTests.js instead.

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

Author: romtsn

jest.config.js

@@ -1,8 +1,8 @@
 module.exports = {
   collectCoverage: true,
   testEnvironment: 'node',
-  setupFiles: ['<rootDir>/setupTests.js'],
-  testPathIgnorePatterns: ['<rootDir>/src/', '<rootDir>/tests/integration/'],
+  setupFiles: ['./setupTests.js'],
+  testPathIgnorePatterns: ['./src/', './tests/integration/'],
   transform: {
     '^.+\\.ts$': 'ts-jest',
   },