chore: manual sync for leaf apps, keep root app-of-apps automated

Convention: only the root app-of-apps (platform) auto-syncs so it picks up
new/changed child Application definitions from Git. Every leaf service app
(vault, headlamp, harbor, jenkins, sonarqube, external-secrets,
kube-prometheus-stack) now requires an explicit manual Sync — matches
cluster-bootstrap and homelab-services' existing ignis convention.

platform/apps/external-secrets/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: external-secrets
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - ServerSideApply=true

platform/apps/harbor/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: harbor
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - SkipDryRunOnMissingResource=true

platform/apps/headlamp/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: headlamp
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - SkipDryRunOnMissingResource=true

platform/apps/jenkins/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: jenkins
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - SkipDryRunOnMissingResource=true

platform/apps/kube-prometheus-stack/application.yaml

@@ -36,10 +36,8 @@ spec:
       jsonPointers:
         - /spec/rules/0/backendRefs/0/group
         - /spec/rules/0/backendRefs/0/weight
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - ServerSideApply=true

platform/apps/sonarqube/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: sonarqube
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - SkipDryRunOnMissingResource=true

platform/apps/vault/application.yaml

@@ -25,10 +25,8 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: vault
+  # Leaf app — manual sync only; root `platform` app-of-apps stays automated.
   syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
     syncOptions:
       - CreateNamespace=true
       - SkipDryRunOnMissingResource=true