Add partSku field to GCodeFile model for enhanced object filtering

- Introduced a new 'partSku' field in the GCodeFile model, which is required and supports object type filtering.
- Implemented a masterFilter function to facilitate filtering based on the associated part ID, improving data management and retrieval.

src/database/models/GCodeFile.js

@@ -288,6 +288,19 @@ export const GCodeFile = {
           required: true,
           showHyperlink: true
         },
+        {
+          name: 'partSku',
+          label: 'Part SKU',
+          type: 'object',
+          objectType: 'partSku',
+          required: true,
+          showHyperlink: true,
+          masterFilter: (objectData) => {
+            const partId = objectData?.part?._id
+            if (partId == null) return {}
+            return { part: partId }
+          }
+        },
         {
           name: 'quantity',
           label: 'Quantity',