feat(server): add a company material list with list/add endpoints

Nests, drawings and releases store material and grade as free text, so
there was no canonical list for clients to suggest from or to fix
spelling against. Schema v10 adds materials and material_grades keyed by
SharedListNames.Key, with GET/POST /api/materials. Adding is idempotent
by key and keeps the first spelling.

The tables start empty: the materials already stored did not import
cleanly, so the list is filled through the API instead. Existing
free-text columns are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

OpenNest.Server.Tests/DrawingLibraryDatabaseTests.cs

@@ -22,7 +22,7 @@ public sealed class DrawingLibraryDatabaseTests
             using (var database = new NestDatabase(factory.DatabasePath, pooling: false))
                 Assert.Empty(database.QueryDrawings(new DrawingLibraryQuery { IncludeArchived = true }).Items);
             Assert.Equal(before, NestDigest(factory.DatabasePath));
-            Assert.Equal(9L, Scalar(factory.DatabasePath, "PRAGMA user_version"));
+            Assert.Equal(10L, Scalar(factory.DatabasePath, "PRAGMA user_version"));
         }
 
         using var upgraded = new NestDatabase(factory.DatabasePath, pooling: false);
@@ -43,7 +43,7 @@ public sealed class DrawingLibraryDatabaseTests
 
         using (var database = new NestDatabase(factory.DatabasePath, pooling: false))
         {
-            Assert.Equal(9L, Scalar(factory.DatabasePath, "PRAGMA user_version"));
+            Assert.Equal(10L, Scalar(factory.DatabasePath, "PRAGMA user_version"));
             Assert.Equal(before, NestDigest(factory.DatabasePath));
             // Two distinct blobs across four revisions: the bracket's notes edit and the
             // plate both reuse the bracket's first package.
@@ -80,7 +80,7 @@ public sealed class DrawingLibraryDatabaseTests
     {
         using var factory = new ServerFactory();
         using (new NestDatabase(factory.DatabasePath, pooling: false)) { }
-        Execute(factory.DatabasePath, "PRAGMA user_version=10");
+        Execute(factory.DatabasePath, "PRAGMA user_version=11");
 
         Assert.Throws<InvalidOperationException>(() => new NestDatabase(factory.DatabasePath, pooling: false));
     }