refactor(external-dns): use cloudflare-token secret name

Change secret reference from external-dns-secret to cloudflare-token
for unified secret naming across services.

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

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

Author: justgithubaccount

platform/infrastructure/networking/external-dns/base/application.yaml

@@ -27,7 +27,7 @@ spec:
           - name: CF_API_TOKEN
             valueFrom:
               secretKeyRef:
-                name: external-dns-secret
+                name: cloudflare-token
                 key: CLOUDFLARE_TOKEN
   syncPolicy:
     automated: