feat(analyzer): add Korean-language context terms to KrRrnRecognizer

[juno-junho]

Change Description

Add Korean-language context terms (주민등록번호, 주민번호, 신분증, 본인인증) to KrRrnRecognizer.CONTEXT, with a regression test.

The context list was English-only, so LemmaContextAwareEnhancer could never boost KR_RRN confidence on Korean-language text, which is the primary language Korean RRNs appear in. Every other Korean recognizer (driver license, passport, FRN, BRN) already ships Korean context terms. The last two terms are broader identity-related words, so feel free to ask me to drop them if you prefer the conservative set. All four come from a production Korean PII-masking deployment.

pytest tests/test_kr_rrn_recognizer.py and ruff check pass.

Issue reference

Fixes #2212

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