Initial codebase setup

[jaykayudo]

Overview

This PR establishes a comprehensive development environment for our Node.js Express backend with TypeORM integration. It introduces a well-structured project architecture, configuration files, and quality assurance tools to ensure consistent code quality and maintainable development practices.

Changes

Core Backend Architecture

• Set up Express.js application structure with TypeORM integration
• Implemented organized directory structure following best practices
• Created essential configuration files for database connections
• Added environment variable management
• Established controller-service-repository pattern
• Set up error handling middleware

Development Environment

• Configured TypeScript with appropriate compiler options
• Added NPM scripts for development, building, and database migrations
• Implemented data entity models with TypeORM decorators
• Created routing architecture with controller integration

Code Quality Tools

• Added ESLint with flat configuration (CommonJS version)
• Configured Prettier for consistent code formatting
• Created comprehensive .prettierignore file
• Set up GitHub Actions workflow for CI formatting checks
• Added linting and formatting scripts to package.json

Implementation Details

• Used TypeORM for database interactions with migration support
• Implemented clear separation of concerns with controllers, services, and repositories
• Set up scalable project structure to support future growth
• Configured TypeScript with strict type checking
• Used ESLint's flat config format for better performance and flexibility

Related Issue

FIxes #1