.NET Framework 4.8 업그레이드 및 WebView2 통합

- 모든 프로젝트를 .NET Framework 4.0 → 4.8로 업그레이드
- WebView2 NuGet 패키지 추가 (v1.0.3537.50)
- 사용자 매뉴얼 폼 추가 (Frm_WebManual)
  * WebView2 컨트롤 통합
  * localhost:58123 자동 로드
  * MDI 메인 메뉴에 Manual 항목 추가

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

ArinWarev1/packages.config

@@ -1,8 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Microsoft.Owin" version="2.1.0" targetFramework="net40" />
   <package id="Microsoft.Owin.Host.HttpListener" version="2.1.0" targetFramework="net40" />
   <package id="Microsoft.Owin.Hosting" version="2.1.0" targetFramework="net40" />
   <package id="Microsoft.Owin.StaticFiles" version="2.1.0" targetFramework="net40" />
+  <package id="Microsoft.Web.WebView2" version="1.0.3537.50" targetFramework="net48" />
   <package id="Owin" version="1.0" targetFramework="net40" />
-</packages>
+</packages>