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/secret-renovate.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: renovate-token
+  namespace: renovate
+type: Opaque
+stringData:
+  # Reemplazar con el token de Gitea que crees en:
+  # https://git.chemavx.xyz/user/settings/applications
+  RENOVATE_TOKEN: "PLACEHOLDER"