Fix Gitea repo search: correct service name and add UI support

- GITEA_URL was pointing to gitea.platform.svc but the Helm chart
  names the HTTP service gitea-helm-http.platform.svc
- Add Gitea badge (GT, green) to repo search results UI
- Update placeholder and credential hint to mention Gitea
- Rewrite internal service URLs to external gitea.coreworlds.io in
  search results so agents can clone from outside the cluster
- Add error logging to diagnose search failures

apps/harness/k8s/base/deployment.yaml

@@ -40,7 +40,7 @@ spec:
                   name: harness-mcp-credentials
                   key: gitea-token
             - name: GITEA_URL
-              value: "http://gitea.platform.svc:3000"
+              value: "http://gitea-helm-http.platform.svc:3000"
             - name: HARNESS_PG_MCP_URL
               valueFrom:
                 secretKeyRef: