Fix Gitea service names: gitea-http → gitea-helm-http

The Gitea Helm chart names services as gitea-helm-http and
gitea-helm-ssh, not gitea-http/gitea-ssh. Update IngressRoute
and runner deployment to match.

infra/kubernetes/platform/traefik/ingressroute-gitea.yaml

@@ -12,7 +12,7 @@ spec:
     - match: Host(`gitea.coreworlds.io`)
       kind: Rule
       services:
-        - name: gitea-http
+        - name: gitea-helm-http
           namespace: platform
           port: 3000
   tls: