feat(collection): 데이터 수집 파이프라인 완전 마이그레이션 (Stage 2-3 완료)

**Stage 2: KIS API 클라이언트 + PostgreSQL 인프라**
- IKisApiClient.cs + KisApiClient.cs 구현
  · 토큰 캐싱 (ITokenCache 통합)
  · 보안 강화: /trading/ 경로 및 주문 TR_ID 차단
  · Windows env var + registry fallback (자격증명)
  · Bearer 토큰 인증

- PostgreSQL 저장소:
  · CollectionRepository (CRUD + 대시보드)
  · PostgresTokenCache (토큰 생명주기)
  · 3개 테이블 자동 생성 (kis_collection_runs, snapshots, errors)
  · Dapper + 원시 SQL (PostgreSQL 호환)

- API DI 등록:
  · builder.Services.AddScoped<ICollectionRepository, CollectionRepository>()
  · builder.Services.AddScoped<ITokenCache, PostgresTokenCache>()
  · builder.Services.AddScoped<IKisApiClient, KisApiClient>()

**Stage 3: Web API 통합 + Blazor UI**
- CollectionEndpoints.cs: 6개 RESTful 엔드포인트
  · GET /api/collection/state (대시보드 요약)
  · GET /api/collection/runs (최근 실행 이력)
  · GET /api/collection/runs/{runId}/snapshots
  · GET /api/collection/runs/{runId}/errors
  · GET /api/collection/latest/{ticker}
  · POST /api/collection/run (비동기 실행 시작)

- Collection.razor: Fluent UI 기반 대시보드
  · 요약 카드 (상태, 스냅샷 수, 에러 수)
  · 최근 에러 테이블
  · 최근 실행 이력
  · Start/Refresh 컨트롤
  · FluentSkeleton 로딩 상태

- ApiClient.cs: 8개 Collection 메서드 + DTO

**보안 거버넌스 강화**
- AssertReadOnly() 차단 목록:
  · FORBIDDEN_PATH_SUBSTRINGS: { "/trading/" }
  · FORBIDDEN_TR_ID_PREFIXES: { "TTTC08", "VTTC08", "TTTC01", "VTTC01", "TTTC8434R", "VTTC8434R" }
  · 출처: governance/rules/06_no_direct_api_trading.yaml

**빌드 결과**
- ✅ Compile: 0 errors, 6 RC warnings (acceptable)
- ✅ Runtime: 성공
- ✅ 서버: http://localhost:5265

**마이그레이션 상태 (CLAUDE.md 업데이트)**
- Phase 1 (Web UI): ✅ COMPLETE
- Phase 2 (KIS API + 데이터 수집): ✅ COMPLETE (통합 테스트 대기)
- Phase 3 (CLI Tools): 📋 PLANNED

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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