v1.09 — Fix ODT download, selective removal, Display Level Full

- Direct CDN download (officecdn.microsoft.com/pr/wsus/setup.exe) instead of broken fwlink redirect
- HttpClient with proper redirect handling, content-type check, file size validation
- Selective C2R removal: each product listed separately, only checked items removed
- OfficeDetector splits ProductReleaseIds into individual entries
- Display Level="Full" for removal (shows Microsoft progress UI)
- Confirmation dialog before removal on all pages

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

InstaSoftOfficeTool.csproj

@@ -9,15 +9,16 @@
     <Company>InstaSoft Zrt.</Company>
     <Product>InstaSoft Office Tool</Product>
     <Copyright>Copyright (c) InstaSoft Zrt. 2026</Copyright>
-    <Version>1.0.8</Version>
-    <AssemblyVersion>1.0.8.0</AssemblyVersion>
-    <FileVersion>1.0.8.0</FileVersion>
+    <Version>1.0.9</Version>
+    <AssemblyVersion>1.0.9.0</AssemblyVersion>
+    <FileVersion>1.0.9.0</FileVersion>
     <ApplicationManifest>app.manifest</ApplicationManifest>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="all" />
+    <Reference Include="System.Net.Http" />
   </ItemGroup>
 
   <ItemGroup>