Add comprehensive .gitignore file for Node.js/TypeScript project

[mr-adonis-jimenez]

Problem

The repository is missing a .gitignore file, which is essential for excluding unnecessary files from version control such as:

• node_modules/ directory
• Build artifacts and compiled files
• Environment files (.env)
• IDE/editor configuration files
• OS-specific files (.DS_Store)
• Log files

Required Changes

Create a comprehensive .gitignore file that includes:

# Dependencies
node_modules/
package-lock.json

# Build outputs
dist/
build/
*.js
*.js.map
*.d.ts
!app.js

# Environment variables
.env
.env.local
.env.*.local

# IDE/Editor
.vscode/
.idea/
*.swp
*.swo
*~

# OS
.DS_Store
Thumbs.db

# Logs
*.log
npm-debug.log*
yarn-debug.log*
yarn-error.log*

# Testing
coverage/
.nyc_output/

# Temporary files
*.tmp
.cache/

Acceptance Criteria

• .gitignore file exists in repository root
• All common Node.js/TypeScript exclusions are covered
• Existing tracked files that should be ignored are removed from git