refactor: OWIN 웹서버 제거, WebView2 VirtualHost 방식으로 전환

- OWIN 관련 패키지 제거 (Microsoft.Owin.*, Microsoft.AspNet.WebApi.*)
- 모든 Web API 컨트롤러 삭제 (Controllers/*.cs)
- Startup.cs 삭제
- 기존 WebView2 Dialog 삭제 (fDashboard, fHolyday, fJobReport, fLogin_WB, fCommon)
- fDashboardNew만 유지 (SetVirtualHostNameToFolderMapping 방식)
- fMain.cs에서 OWIN 서버 시작 코드 제거
- 품목검색/설명서 메뉴 수정 (로컬 파일 참조로 변경)

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

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

Project/Dialog/fDashboard.cs

@@ -1,94 +0,0 @@
-using FCM0000.Mail;
-using FCOMMON;
-using Microsoft.Web.WebView2.Core;
-using Microsoft.Web.WebView2.WinForms;
-using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Forms;
-
-namespace Project.Dialog
-{
-    public partial class fDashboard : fBase
-    {
-        private WebView2 webView21;
-        public fDashboard()
-        {
-            InitializeComponent();
-
-
-            InitializeWebView2();
-
-
-        }
-        bool loadok = false;
-        public void RefreshView()
-        {
-            if (loadok)
-                webView21.Reload();
-        }
-        private void InitializeWebView2()
-        {
-            // 수동으로 WebView2 컨트롤 생성
-            this.webView21 = new WebView2();
-
-            // 기본 속성 설정
-            this.webView21.CreationProperties = null;
-            this.webView21.DefaultBackgroundColor = Color.White;
-            this.webView21.Dock = DockStyle.Fill;
-            this.webView21.Location = new Point(0, 0);
-            this.webView21.Name = "webView21";
-            this.webView21.Size = new Size(800, 600);
-            this.webView21.TabIndex = 0;
-            this.webView21.ZoomFactor = 1D;
-
-            // 폼에 추가
-            this.Controls.Add(this.webView21);
-
-            // 비동기 초기화
-            InitializeAsync();
-        }
-        private async void InitializeAsync()
-        {
-            try
-            {
-                // Fixed Version 경로 설정
-                string runtimePath = Path.Combine(Application.StartupPath, "WebView2Runtime");
-
-                if (Directory.Exists(runtimePath))
-                {
-                    var env = await CoreWebView2Environment.CreateAsync(runtimePath);
-                    await this.webView21.EnsureCoreWebView2Async(env);
-                }
-                else
-                {
-                    // 시스템에 설치된 WebView2 사용
-                    await this.webView21.EnsureCoreWebView2Async();
-                }
-                // OWIN 서버의 DashBoard 페이지로 연결
-                webView21.Source = new Uri($"{Pub.WebServiceURL}/DashBoard");
-                label1.Visible = false;
-                loadok = true;
-            }
-            catch (Exception ex)
-            {
-                MessageBox.Show($"WebView2 초기화 실패: {ex.Message}");
-            }
-        }
-        protected override void OnLoad(EventArgs e)
-        {
-            base.OnLoad(e);
-            EnsureVisibleAndUsableSize();
-        }
-        private void label1_Click(object sender, EventArgs e)
-        {
-
-        }
-    }
-}