chore: prepare for v2.0 release

- Remove bin/obj/publish from git tracking
- Update .gitignore for .NET project (source only)
- Add release.ps1 local publish script (replaces Gitea workflow)
- Remove .gitea/workflows/release.yml
- Fix duplicate group names to show library names
- Fix HTML export to show Name column in duplicates report
- Fix consolidated permissions HTML to show folder/library names

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

SharepointToolbox/Services/Export/DuplicatesHtmlExportService.cs

@@ -77,6 +77,7 @@ public class DuplicatesHtmlExportService
                       <thead>
                         <tr>
                           <th>#</th>
+                          <th>Name</th>
                           <th>Library</th>
                           <th>Path</th>
                           <th>Size</th>
@@ -97,6 +98,7 @@ public class DuplicatesHtmlExportService
                 sb.AppendLine($"""
                           <tr>
                             <td>{j + 1}</td>
+                            <td>{H(item.Name)}</td>
                             <td>{H(item.Library)}</td>
                             <td><a href="{H(item.Path)}" target="_blank">{H(item.Path)}</a></td>
                             <td>{size}</td>