chore: migrate egg-logger into monorepo

## Migration Task

Migrate [`eggjs/egg-logger`](https://github.com/eggjs/egg-logger) into the egg monorepo.

## Source

- Repo: https://github.com/eggjs/egg-logger
- Package: `egg-logger`

## Target

- Path: `packages/logger/`
- Package name: `@eggjs/logger` (or keep `egg-logger`)

## Checklist

- [ ] Move source code to `packages/logger/src/`
- [ ] Update package.json (type: module, exports, publishConfig)
- [ ] Add minimal `tsconfig.json` extending root config
- [ ] Add `vitest.config.ts` and migrate tests
- [ ] Add `src/types.ts` for module augmentation
- [ ] Update root `tsconfig.json` references
- [ ] Update internal dependencies to use `workspace:*`
- [ ] Verify build and tests pass
- [ ] Archive the original repo after migration