feat: move revision tracking to ExportRecord, add perceptual hash comparison, cut list modal, and auto-start API

- Move Revision from Drawing to ExportRecord so each export captures its own revision snapshot
- Add Hamming distance comparison for perceptual hashes (tolerance of 10 bits) to avoid false revision bumps
- Replace CoenM.ImageHash with inline DifferenceHash impl (compatible with ImageSharp 3.x)
- Increase PDF render DPI from 72 to 150 for better hash fidelity
- Add download-dxfs-by-drawing endpoint for cross-export DXF zip downloads
- Prefix DXF filenames with equipment number when no drawing number is present
- Pass original filename to storage service for standalone part exports
- Auto-start FabWorks.Api from ExportDXF client if not already running
- Add cut list modal with copy-to-clipboard in the web UI
- Update PDF hash on existing export records after upload
- Bump static asset cache versions to v3

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

FabWorks.Api/wwwroot/js/pages.js

@@ -213,6 +213,9 @@ const pages = {
                 allBom = [...bomByItem.values()];
             }
 
+            // Store for cut list modal
+            window._currentBom = allBom;
+
             const bomRows = allBom.map((b, i) => {
                 const hasDetails = b.cutTemplate || b.formProgram;
                 const toggleId = `dbom-${b.id}`;
@@ -265,8 +268,12 @@ const pages = {
                         ${bomHeader}
                         <span class="badge badge-count">${allBom.length} items</span>
                         <span style="margin-left:auto;display:flex;gap:6px">
+                            ${dxfCount > 0 ? `<button class="btn btn-sm" onclick="showCutListModal(window._currentBom)">${icons.clipboard} Cut List</button>` : ''}
                             ${pdfHash ? `<a class="btn btn-amber btn-sm" href="/api/filebrowser/download?hash=${encodeURIComponent(pdfHash)}&ext=pdf&name=${pdfName}">${icons.download} PDF</a>` : ''}
-                            ${dxfCount > 0 ? `<a class="btn btn-cyan btn-sm" href="/api/exports/${activeExport.id}/download-dxfs">${icons.download} All DXFs</a>` : ''}
+                            ${dxfCount > 0 ? (singleExport
+                                ? `<a class="btn btn-cyan btn-sm" href="/api/exports/${activeExport.id}/download-dxfs">${icons.download} All DXFs</a>`
+                                : `<a class="btn btn-cyan btn-sm" href="/api/exports/download-dxfs?drawingNumber=${encodeURIComponent(drawingNumber)}">${icons.download} All DXFs</a>`
+                            ) : ''}
                         </span>
                     </div>
                     ${allBom.length ? `