added CURD for comment

[Yoinami]

This pull request implements a complete comment system backend, including controller, service, repository, validation, and error handling. The main focus is on enabling CRUD operations for comments, supporting nested replies, and improving error responses for validation and database errors.

Comment System Implementation:

• Added full CRUD operations for comments, including support for nested replies and validation using Zod in comment.controller.ts, comment.service.ts, and comment.repository.ts. This includes creating, fetching (single and by post), updating, and deleting comments, with proper authentication and authorization checks. [1] [2] [3] [4] [5] [6] [7] [8]

• Introduced Zod-based DTO schemas for validating comment operations, ensuring request data integrity for create, update, and delete actions.

Error Handling Improvements:

• Enhanced the global error handler to properly handle Zod validation errors and Mongoose CastError, returning clear error messages for invalid input and malformed IDs. [1] [2]

Database Model Update:

• Updated the IComment interface to include an optional replies field, supporting nested comment structures.

Configuration:

• Added a .env.example file with environment variable templates for app, database, authentication, Cloudinary, Facebook integration, and rate limiting.

[Yoinami]

there are some github workflow error in the in CI / docker-build