- Added `dotenv` and `prom-client` dependencies for environment variable management and metrics collection.
- Updated `package.json` to include new dependencies and types for `dotenv`.
- Enhanced `README.md` with bilingual features, usage instructions, and project structure.
- Improved `app.config.ts` to validate environment variables using Zod.
- Implemented graceful shutdown in `main.ts` for better service reliability.
- Added metrics middleware and updated routes to include metrics endpoint.
- Enhanced error handling middleware with detailed logging and responses.
- Updated feature and health controllers with bilingual comments and improved structure.
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