Add HPA autoscaling and update PubMEDIS image to 455d984

- Remove replicas:1 override (base has 2)
- Add HPA: min 2, max 5 replicas (CPU 70%, memory 80%)
- Update image tag to 455d984 (OAuth pre-render fix)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

environments/pubmedis/overlays/production/kustomization.yaml

@@ -3,16 +3,8 @@ kind: Kustomization
 
 resources:
   - ../../base
+  - hpa.yaml
 
 images:
   - name: 10.0.0.3:31427/gitea_admin/pubmedis
-    newTag: "b8d4cf6"
-
-patches:
-  - target:
-      kind: Deployment
-      name: pubmedis
-    patch: |-
-      - op: replace
-        path: /spec/replicas
-        value: 1
+    newTag: "455d984"