fix(restheadspec): return 200 OK with empty body instead of 204 on zero results

Frontend clients are sensitive to 204 No Content responses; always return 200
with an empty array/object and rely on X-No-Data-Found header to signal absence
of records.

Also treat "change" as an alias for "update" in recursive CUD processing.

pkg/common/recursive_crud.go

@@ -141,7 +141,7 @@ func (p *NestedCUDProcessor) ProcessNestedCUD(
 			logger.Debug("Skipping insert for %s - no data columns besides _request", tableName)
 		}
 
-	case "update":
+	case "update", "change":
 		// Only perform update if we have data to update
 		if hasData {
 			rows, err := p.processUpdate(ctx, regularData, tableName, data[pkName])