fix(k8s): stabilize keycloak rollout and align CD deploy manifests

Update Keycloak probe/realm import behavior and authority config so auth services start reliably on the dev cluster, while keeping CD deployment steps aligned with the actual Kubernetes overlay behavior.

infra/k8s/base/backend-deployment.yaml

@@ -67,8 +67,13 @@ spec:
             secretKeyRef:
               name: workclub-secrets
               key: database-connection-string
-        - name: Keycloak__Url
+        - name: Keycloak__Authority
           valueFrom:
             configMapKeyRef:
               name: workclub-config
-              key: keycloak-url
+              key: keycloak-authority
+        - name: Keycloak__Audience
+          valueFrom:
+            configMapKeyRef:
+              name: workclub-config
+              key: keycloak-audience