Update permission context handling and improve JSON field component

- Enhanced `MediaController` to include context in the `entityCreate` permission for better access control.
- Refactored permission checks in `useBkndAuth` to ensure correct validation of role permissions.
- Modified `JsonField` component to directly use `formData` in `JsonEditor`, simplifying data handling and improving user experience.

app/src/media/api/MediaController.ts

@@ -189,7 +189,9 @@ export class MediaController extends Controller {
             }),
          ),
          jsc("query", s.object({ overwrite: s.boolean().optional() })),
-         permission(DataPermissions.entityCreate, {}),
+         permission(DataPermissions.entityCreate, {
+            context: (c) => ({ entity: c.req.param("entity") }),
+         }),
          permission(MediaPermissions.uploadFile, {}),
          async (c) => {
             const { entity: entity_name, id: entity_id, field: field_name } = c.req.valid("param");