refactor(cert-manager): remove duplicate Cloudflare secret

Remove cloudflare-secrets.yaml - secret is now replicated from
external-dns namespace via Reflector.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: justgithubaccount

platform/infrastructure/networking/cert-manager/base/cloudflare-secrets.yaml

@@ -1,5 +1,5 @@
 resources:
   - application.yaml
-  - cloudflare-secrets.yaml
   - cert-cluster.yaml
-  - issuer-cluster.yaml
+  - issuer-cluster.yaml
+# cloudflare-secrets.yaml removed - using Reflector from external-dns namespace