test: migrate from Jest to Vitest

- Replace Jest with Vitest for faster test execution
- Update test files to use Vitest API (vi instead of jest)
- Add vitest and @vitest/coverage-v8 dependencies
- Remove jest, ts-jest, @types/jest, and ts-node dependencies
- Create vitest.config.mts with coverage thresholds
- Rename test files from .mts to .ts
- Update tsconfig.json moduleResolution to bundler
- Update snapshot format for Vitest

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: remarkablemark