feat: add permission check for instrument code retrieval endpoint

cooleshow-app/src/main/java/com/yonge/cooleshow/admin/controller/MusicSheetController.java

@@ -169,6 +169,7 @@ public class MusicSheetController extends BaseController {
     @ApiImplicitParams({
         @ApiImplicitParam(name = "id", value = "id", dataType = "long")
     })
+    @PreAuthorize("@pcs.hasPermissions('music/sheet/instrumentCode')")
     @GetMapping("/instrumentCode")
     public R<List<MusicSheetWrapper.InstrumentCode>> instrumentCode() {