Initial commit: Antigravity dev container with Happy Coder

Add containerized GUI development environment featuring:
- Antigravity IDE (VSCode) accessible via web browser
- Happy Coder AI assistant integration
- Automatic GitHub repository cloning on startup
- Persistent user home directory (ReadWriteMany PVC)
- Secure non-root execution as user claude (UID 1000)

Components:
- Dockerfile based on jlesage/baseimage-gui
- Startup scripts for repo initialization and app launch
- Kubernetes manifests (StatefulSet, ConfigMap, Secrets)
- Makefile for build and deployment automation
- Comprehensive documentation

Features:
- Web-based VNC interface (port 5800)
- GitHub token authentication for private repos
- Happy Coder runs as background service in workspace
- CephFS storage for persistent home directory
- Configurable display resolution and security

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/secrets-example.yaml

@@ -0,0 +1,18 @@
+---
+# Example secrets - DO NOT commit actual secrets!
+# Use SealedSecrets or another secret management solution
+
+apiVersion: v1
+kind: Secret
+metadata:
+  name: antigravity-secrets
+type: Opaque
+stringData:
+  # GitHub Personal Access Token (for private repos)
+  github-token: "ghp_your_token_here"
+
+  # Happy Coder API Key
+  happy-coder-api-key: "your_happy_coder_api_key"
+
+  # VNC Password (optional, for secure VNC access)
+  vnc-password: "your_vnc_password"