refactor: 对齐 MetonaEditor — babel-jest 替代 ts-jest

### Changed
- 测试框架: ts-jest → babel-jest (对齐 MetonaEditor 生产方案)
- jest.config.cjs: babel-jest transform + moduleNameMapper
- test 脚本: jest → jest --coverage (对齐 MetonaEditor)
- 移除 ts-jest, 新增 @babel/core/preset-env/preset-typescript/babel-jest

### Added
- babel.config.cjs (对齐 MetonaEditor)

### Fixed
- 恢复 tslib (@rollup/plugin-typescript 必需依赖)

### Verified
- tsc --noEmit: 零错误
- jest --no-coverage: 136/136 passed
- rollup build: 5 outputs

babel.config.cjs

@@ -0,0 +1,9 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', { targets: { node: 'current' }, modules: 'commonjs' }],
+    '@babel/preset-typescript',
+  ],
+  plugins: [
+    '@babel/plugin-transform-modules-commonjs',
+  ],
+};