chore: add @vitest/coverage-v8 dependency to package.json
chore: update pnpm-lock.yaml with new dependencies and versions
test: enhance env.test.ts to validate environment variable handling and defaults
- Replace Jest imports and mocks with Vitest equivalents in setup and unit tests.
- Adjust test cases to use async imports and reset modules with Vitest.
- Add Vitest configuration file for test environment setup and coverage reporting.
feat: enhance server initialization with environment validation and import processing scheduler
test: add Jest setup for unit tests and mock console methods
test: implement unit tests for environment management and validation
test: create unit tests for transcript fetcher functionality
