Change UI NodePort from 30080 to 30090

Port 30080 is already allocated. Updated deploy manifests,
CORS origin, and HOWTO.md references.

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

deploy/server.yaml

@@ -51,7 +51,7 @@ spec:
                   key: CAMELEER_UI_PASSWORD
                   optional: true
             - name: CAMELEER_UI_ORIGIN
-              value: "http://192.168.50.86:30080"
+              value: "http://192.168.50.86:30090"
           resources:
             requests:
               memory: "256Mi"