[bug] Make "issued_by" field read-only (#11816)

* Fix "issued_by" for BuildOrder model

- Automatically capture user information
- Mark field as read-only
- Remove from frontend forms

* Add "created_by" property

* Update unit test

* Update API and CHANGELOG

* Further adjustments to unit tests

CHANGELOG.md

@@ -18,6 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+[#11816](https://github.com/inventree/InvenTree/pull/11816) makes the `issued_by` field on the `Build` API read only, and instead sets the `issued_by` field to the current user when a build is created. This change was made to ensure that the `issued_by` field accurately reflects the user who created the build, and to prevent users from setting this field to an arbitrary value when creating or updating a build.
+
 ### Removed
 
 ## 1.3.0 - 2026-04-11