WatchlistCheckHandler: integrate a real sanctions/watchlist API (OFAC/EU/UN) instead of the stub

[ahmetabdullahgultekin]

Inline code marker.

Location: src/main/java/com/fivucsas/identity/application/service/verification/handlers/WatchlistCheckHandler.java:64

TODO: Replace with real sanctions API call (also docstring L37: integrate OFAC / EU / UN sanctions lists).

The marker stays in the code (annotated (#this) in place).

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Migrated from src/main/java/com/fivucsas/identity/application/service/verification/handlers/WatchlistCheckHandler.java:64.