Fix startup scripts and k8s config for initial deployment

- Fix chown/sudo to use numeric UID/GID instead of hardcoded 'claude'
  username (baseimage-gui creates users dynamically, name not available
  at script runtime)
- Fix image name: ghcr.io/cpfarhood/devcontainer (matches github.repository)
- Fix ConfigMap name: antigravity-config -> antigravity (matches statefulset refs)
- Set github-repo in ConfigMap to headlamp-polaris-plugin
- Set HTTPRoute to external gateway at antigravity.dev.farh.net
- Add CLAUDE.md for Claude Code guidance

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

k8s/httproute.yaml

@@ -5,10 +5,10 @@ metadata:
   name: antigravity
 spec:
   parentRefs:
-  - name: gateway  # Replace with your Gateway name
-    namespace: gateway-system  # Replace with your Gateway namespace
+  - name: external
+    namespace: gateway-system
   hostnames:
-  - "antigravity.example.com"  # Replace with your domain
+  - "antigravity.dev.farh.net"
   rules:
   - matches:
     - path: