fix: security, data-integrity, and doc-drift findings from repo audit

Consolidates duplicate KIS API client implementations (governance tests
were exercising an unused class instead of the one actually running in
production), closes a SQL injection path in the DB admin page, fixes a
migration that used MySQL-only syntax and had never actually applied
(confirmed against production), resyncs docs/db/quantengine.dbml with
all migrations, and removes a duplicate OMS·WMS·ERP frontend tree in
favor of src/frontend/. Also corrects several unverifiable/inflated
claims in the OMS planning docs and realigns CI/CD and architecture
documentation with what's actually in the repo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

spec/61_strategic_execution_framework.yaml

@@ -1,5 +1,10 @@
 # OMS·WMS·ERP Strategic Execution Framework v1.0
-# Based on actual PDF specifications (not hallucinated)
+# ⚠️ PDF 출처 미검증 (2026-07-30 재정정): 이 헤더는 원래 "실제 PDF 5건(179페이지)에
+# 근거" (not hallucinated)라고 주장했으나, 저장소 전체를 검색해도 해당 PDF는 어디에도
+# 없다. 본문에 흩어진 "(PDF n...)" 인용 40여 건은 전부 미검증 상태로 취급할 것 —
+# 원본 PDF를 저장소(또는 접근 가능한 공유 위치)에서 찾아 재검증하기 전까지는
+# "확인됨"이 아니라 "출처 주장됨"이다. (참고: 이 파일은 759줄이며, 다른 문서에서
+# "7,000+ lines"로 인용된 것은 사실이 아니다.)
 # 30 Strategic Principles Applied Throughout
 # Created: 2026-07-26 (Post-Advisor Correction)