feat(export): integrate CutFab API in export flow

- Export to temp directory and auto-upload PDF/DXF

- Resolve or create drawing via API using selected Equipment ID

- Upload DXFs per-part and create BOM items

- Attempt auto-linking of templates after export

- Add EquipmentId to ExportContext

ExportDXF/Models/ExportContext.cs

@@ -32,6 +32,11 @@ namespace ExportDXF.Services
         /// </summary>
         public string FilePrefix { get; set; }
 
+        /// <summary>
+        /// Selected Equipment ID for API operations (optional).
+        /// </summary>
+        public int? EquipmentId { get; set; }
+
         /// <summary>
         /// Cancellation token for canceling the export operation.
         /// </summary>
@@ -127,4 +132,4 @@ namespace ExportDXF.Services
             return SolidWorksApp?.NewDocument(templatePath, paperSize, width, height) as ModelDoc2;
         }
     }
-}
+}