Add SEFCON API — Korean stock fundamentals from DART XBRL

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SEFCON API provides Korean stock fundamentals parsed directly from DART XBRL (Korea's official SEC-equivalent regulatory filings) — not resold from FnGuide or KisValue.

• 1,200+ KOSPI/KOSDAQ companies
• 10-year annual financials (EPS, BPS, ROE, OPM, FCF, DPS)
• SCI quality scores & sector cycle detection (19 sectors)
• Macro crisis index (AUROC 0.927)
• Free plan available on RapidAPI

API docs: https://api.sefcon.kr

[wilsonfreitas]

Thanks for the contribution. SEFCON is a hosted proprietary API without substantive public source, so it belongs under Commercial & Proprietary Services, not Market Data & Data Sources. Please provide a stable public link documenting the exact permanent free-tier limits, whether payment information is required, and the available API documentation or examples. The current entry also fails validation because it lacks a required backtick tag in its present non-commercial section.