feat: Improve material ordering and default type in MCP tools

- Add SortOrder as secondary ordering key after Shape across all material
  queries (list_materials, search methods)
- Default material type to "Steel" when not specified in add_stock_with_offering

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Controllers/MaterialsController.cs

@@ -22,6 +22,7 @@ public class MaterialsController : ControllerBase
         var materials = await _context.Materials
             .Where(m => m.IsActive)
             .OrderBy(m => m.Shape)
+            .ThenBy(m => m.SortOrder)
             .ThenBy(m => m.Size)
             .Select(m => new MaterialDto
             {

CutList.Web/Services/MaterialService.cs

@@ -157,7 +157,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Diameter >= minValue && d.Diameter <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -174,7 +174,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.OuterDiameter >= minValue && d.OuterDiameter <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -191,7 +191,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Width >= minValue && d.Width <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -208,7 +208,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Size >= minValue && d.Size <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -225,7 +225,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Size >= minValue && d.Size <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -242,7 +242,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Width >= minValue && d.Width <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -259,7 +259,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Leg1 >= minValue && d.Leg1 <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -276,7 +276,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Height >= minValue && d.Height <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -293,7 +293,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.Height >= minValue && d.Height <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -310,7 +310,7 @@ public class MaterialService
             .Where(d => d.Material.IsActive)
             .Where(d => d.NominalSize >= minValue && d.NominalSize <= maxValue)
             .Select(d => d.Material)
-            .OrderBy(m => m.Size)
+            .OrderBy(m => m.SortOrder).ThenBy(m => m.Size)
             .ToListAsync();
     }
 
@@ -328,7 +328,7 @@ public class MaterialService
             query = query.Where(m => m.IsActive);
         }
 
-        return await query.OrderBy(m => m.Size).ToListAsync();
+        return await query.OrderBy(m => m.SortOrder).ThenBy(m => m.Size).ToListAsync();
     }
 
     /// <summary>