feat: complete ArgoCD migration for Radarr and Sonarr with lessons learned

- Fix ArgoCD multi-source applications (remove conflicting source: section)
- Restore original volume mount configuration using plex-data PVC
- Update ingress class from nginx to traefik for K3s compatibility
- Remove unnecessary compatibility patches (myvolume PVC)
- Document comprehensive ArgoCD migration guidelines in CLAUDE.md
- Add chart-specific configuration patterns for Bananaspliff charts
- Include pre/post migration checklists and verification commands

Both applications now working exactly as before migration with:
- Original service ports (Radarr:7878, Sonarr:8989)
- Complete access to existing configurations and databases
- External accessibility via radarr.gilgamezh.me and sonarr.gilgamezh.me
- Automatic image updates enabled for latest tag tracking

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

applications/radarr.yaml

@@ -17,19 +17,15 @@ metadata:
     argocd-image-updater.argoproj.io/git-commit-message: "chore: update Radarr image to {{.NewTag}}"
 spec:
   project: default
-  source:
-    repoURL: https://bananaspliff.github.io/geek-charts
-    chart: radarr
-    targetRevision: "*"
-    helm:
-      releaseName: radarr
-      valueFiles:
-        - $values/helm-values/radarr_values.yaml
   sources:
     - repoURL: https://bananaspliff.github.io/geek-charts
       chart: radarr
       targetRevision: "*"
       ref: charts
+      helm:
+        releaseName: radarr
+        valueFiles:
+          - $values/helm-values/radarr_values.yaml
     - repoURL: http://gitea-http.gitea.svc.cluster.local:3000/admin/turingpi.git
       targetRevision: HEAD
       ref: values