Grant teslamate user superuser for extension management

TeslaMate migrations need to create/drop PostgreSQL extensions
(cube, earthdistance) which requires superuser privileges.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

argocd/manifests/databases/blumeops-pg.yaml

@@ -44,8 +44,10 @@ spec:
         passwordSecret:
           name: blumeops-pg-borgmatic
       # teslamate user for TeslaMate Tesla data logger
+      # Note: superuser required for extension management during migrations
       - name: teslamate
         login: true
+        superuser: true
         connectionLimit: -1
         ensure: present
         inherit: true