feat(kis): KIS API 클라이언트 .NET 포팅 완료

**구현:**
- IKisApiClient.cs: 완전한 read-only 메서드 인터페이스
  - GetCurrentPriceAsync, GetAskingPrice10LevelAsync
  - GetDailyShortSaleAsync, GetDailyItemChartPriceAsync
  - GetInvestorTrendAsync

- KisApiClient.cs: 완전한 .NET 구현 (kis_api_client_v1.py 포팅)
  - KisCredentials: 환경변수 + Windows 레지스트리 폴백
  - ITokenCache 통합: PostgreSQL 기반 토큰 캐싱
  - AssertReadOnly: 주문 API 차단 (governance/rules/06_no_direct_api_trading.yaml)
  - HttpClient: 비동기 API 호출 + 헤더 관리
  - 모든 quotation 조회 메서드 구현

**보안:**
- FORBIDDEN_PATH_SUBSTRINGS: "/trading/" 경로 차단
- FORBIDDEN_TR_ID_PREFIXES: TTTC/VTTC 주문 TR_ID 차단
- 매수/매도 API 절대 호출 불가 (2차 방어)

**DI 통합:**
- Program.cs: builder.Services.AddScoped<IKisApiClient, KisApiClient>();
- HttpClientFactory 패턴 활용

**다음 단계:**
- PostgresTokenCache 구현
- CollectionRepository PostgreSQL 구현
- Collection 엔드포인트 완성
- Web API 통합 테스트

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

src/dotnet/QuantEngine.Infrastructure/obj/Debug/net10.0/QuantEngine.Infrastructure.AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("QuantEngine.Infrastructure")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+aad4788e8430ad7244d0628047aaf40d0590ef95")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+66f75d90147cc79aede830c90dd0b6fefe5dce0b")]
 [assembly: System.Reflection.AssemblyProductAttribute("QuantEngine.Infrastructure")]
 [assembly: System.Reflection.AssemblyTitleAttribute("QuantEngine.Infrastructure")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

src/dotnet/QuantEngine.Infrastructure/obj/Debug/net10.0/QuantEngine.Infrastructure.AssemblyInfoInputs.cache

@@ -1 +1 @@
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+d5c5f777488b3948c52768724c22864266e92e3ebbb4d65d72d02b574d714276

src/dotnet/QuantEngine.Infrastructure/obj/Debug/net10.0/QuantEngine.Infrastructure.csproj.CoreCompileInputs.cache

@@ -1 +1 @@
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+fa897814897a7f9fc8482c16d1fdf5031e7aaa5172cdd1a52e59a54d590109c6