Remove invalid HelmRelease dependency

Removed dependency on 'mcp-secrets' HelmRelease which doesn't exist.
Secrets are deployed via Kustomize in the same namespace.

platform/mcp-servers/helmrelease.yaml

@@ -15,11 +15,6 @@ spec:
         namespace: flux-system
       interval: 5m
 
-  # Depend on namespace and secrets
-  dependsOn:
-    - name: mcp-secrets
-      namespace: mcp
-
   install:
     createNamespace: false
     remediation: