Add ExtendedAttributes config toggle for system+user attributes

When GalaxyRepository.ExtendedAttributes is true, uses the extended
attributes query that includes both primitive (system) and dynamic
(user-defined) attributes. Default is false (dynamic only, preserving
existing behavior). Extended mode returns ~564 attributes vs ~48.

Adds PrimitiveName and AttributeSource fields to GalaxyAttributeInfo.
Includes 5 new unit tests and 6 new integration tests covering both
standard and extended attribute modes.

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

src/ZB.MOM.WW.LmxOpcUa.Host/Domain/GalaxyAttributeInfo.cs

@@ -13,5 +13,7 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
         public string DataTypeName { get; set; } = "";
         public bool IsArray { get; set; }
         public int? ArrayDimension { get; set; }
+        public string PrimitiveName { get; set; } = "";
+        public string AttributeSource { get; set; } = "";
     }
 }