[ci skip] fix nextcloud: increase memory to 4Gi, extend startup probe

- Memory limit: 2Gi → 4Gi (VPA target is 2.8Gi, was OOMKilling)
- Memory request: 512Mi → 1Gi
- Startup probe: 30s delay, 10s timeout, 60 failures (10min total)
  Previous 5min window was too short for NFS-backed SQLite init

stacks/nextcloud/chart_values.yaml

@@ -48,10 +48,10 @@ persistence:
 
 startupProbe:
   enabled: true
-  initialDelaySeconds: 10
+  initialDelaySeconds: 30
   periodSeconds: 10
-  timeoutSeconds: 5
+  timeoutSeconds: 10
-  failureThreshold: 30
+  failureThreshold: 60
   successThreshold: 1
 
 podAnnotations:
@@ -64,10 +64,10 @@ collabora:
 resources:
   limits:
     cpu: "2"
-    memory: 2Gi
+    memory: 4Gi
   requests:
     cpu: 100m
-    memory: 512Mi
+    memory: 1Gi
 
 cronjob:
   enabled: true