GridOpticsServer discards configured manager credential (:221-224), hardcoded system/manager always used (:447)

[craigpnnl]

Pre-existing defect found during the security review of the primary fix (not introduced by it). GridOpticsServer.java:221-224 compute the configured manager user/password via getProperty(...) but discard the return values, so the literal system/manager at line 447 is always used regardless of config. The broker system credential is therefore not actually configurable. Confirm intended behavior before changing.

Workspace card: GADP-014. Related: GRIDAPPSD/GOSS-GridAPPS-D#1882.

[craigpnnl]

Resolved by PR #45, merged to develop on 2026-07-10. Closing manually: the auto-close keyword only fires on merges to the default branch (master), and this merged to develop.