v0.1.2: Estimated Salary Calculation

What's New

✨ Features

• Estimated Average Monthly Salary Calculation: Calculate estimated employee salaries based on pension contributions
• Enhanced Business Detail API: Now includes estimated_avg_monthly_salary field in responses
• Period Status Enhancement: Added salary estimation to period status queries

📚 Documentation

• Added Codex CLI installation instructions
• Improved README with employee count and salary features explanation
• Added API key usage limitations warning (10,000 daily limit)
• Fixed GitHub repository URLs in package metadata
• Added version control best practices to CLAUDE.md

🔧 Technical Details

• Calculation formula: Monthly Amount ÷ Subscribers ÷ 0.09 (pension rate)
• Fixed API field mapping: jnngp_cnt (subscribers) and crrmm_ntc_amt (monthly amount)

⚠️ Important Notes

• The test API key has a daily limit of 10,000 calls shared among all users
• Salary calculations are estimates based on pension contributions
• For production use, please obtain your own API key from the Korean Public Data Portal