🇰🇷 Korean DART Integration — 115,000 Korean companies database

New

• ✓ Korean company search — Search 115,000 companies from DART database by name (Korean/English) or stock code and bulk-add to table
• ✓ Korean listed company financials — Auto-fetch financial data (revenue, operating income, etc.) from DART for Korean listed companies
• ✓ Auto company master sync — Weekly batch updates all DART company data (corpCode.xml)
• ✓ English name support — Official English names for 3,949 listed companies fetched from DART. Supports English company search