feat: deploy Renovate Bot via CronJob for automatic dependency updates

- CronJob every 6h, concurrencyPolicy: Forbid
- Platform gitea at git.chemavx.xyz, repos: researchowl, polymarket-bot, n8n
- packageRules: major=PR only, patch=automerge, private registry disabled
- Secret placeholder for Gitea token (fill in before applying ArgoCD app)
- ArgoCD Application with automated sync

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

renovate/argocd-app.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: renovate
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://git.chemavx.xyz/chemavx/k8s-manifests
+    targetRevision: HEAD
+    path: renovate
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: renovate
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true