chore(image-updater): use Git write-back for all apps

Set write-back-method=git with write-back-target to this repo, branch=master, and commit identity. Keeps image-list and strategies.\n\nCommitted via Codex CLI.

applications/radarr.yaml

@@ -10,6 +10,11 @@ metadata:
     argocd-image-updater.argoproj.io/radarr.update-strategy: digest
     # Write changes back to Git repository (GitOps workflow)
     argocd-image-updater.argoproj.io/write-back-method: git
+    argocd-image-updater.argoproj.io/write-back-target: http://gitea-http.gitea.svc.cluster.local:3000/admin/turingpi.git
+    argocd-image-updater.argoproj.io/git-branch: master
+    argocd-image-updater.argoproj.io/git-commit-user: argocd-image-updater
+    argocd-image-updater.argoproj.io/git-commit-email: argocd@turing.lan
+    argocd-image-updater.argoproj.io/git-commit-message: "chore: update Radarr image to {{.NewTag}}"
     # Git configuration for write-back
     argocd-image-updater.argoproj.io/git-branch: master
     argocd-image-updater.argoproj.io/git-commit-user: argocd-image-updater
@@ -38,4 +43,4 @@ spec:
       selfHeal: true
     syncOptions:
     - CreateNamespace=true
-    - ServerSideApply=true
+    - ServerSideApply=true