Supply inert UAT provider configuration

docs/VPS_STAGING_PLAN.md

@@ -166,6 +166,12 @@ The bundle is a template until it passes Compose rendering, Authelia validation,
 image build, container health, and private loopback smoke tests. Nginx activation
 and public DNS remain later checkpoints.
 
+Known application constraint: provider clients are constructed during startup
+even when `ENABLE_SCHEDULED_JOBS=false`. The synthetic UAT Compose file therefore
+supplies explicit inert provider values. No provider fetch is scheduled, and
+real provider credentials must not be added until their contracts and handling
+are reviewed.
+
 ## Manual release procedure
 
 Continuous deployment is deliberately out of scope for the first testing