feat(packages): add relay-free-llm package

Add RelayFreeLLM, a RESTful API gateway that routes prompts to multiple
AI providers (Gemini, Cerebras, Groq, Mistral, etc.) with failover and
intent-based routing. Includes local cerebras-cloud-sdk build since it is
not yet in nixpkgs.

README.md

@@ -23,6 +23,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `kubernetes-mcp-server` | Model Context Protocol (MCP) server for Kubernetes and OpenShift | MCP Servers |
 | `loop` | Corporate messenger for your team | Communication |
 | `radar` | Modern Kubernetes visibility — topology, event timeline, service traffic, resource browsing, Helm management, and GitOps support | Kubernetes |
+| `relay-free-llm` | RESTful API to route user prompts to various AI model providers with automatic failover and intent-based routing | AI LLM Gateway |
 | `stakpak` | DevOps AI agent that generates infrastructure code, debugs Kubernetes, configures CI/CD, and automates deployments | AI Agents |
 
 ## Usage
@@ -121,6 +122,7 @@ nix-overlay/
 │   ├── loop/                   # Corporate messenger for your team
 │   ├── mcp-gateway/            # MCP protocol gateway
 │   ├── radar/                  # Kubernetes UI (topology, timeline, Helm, GitOps)
+│   ├── relay-free-llm/        # AI model provider routing gateway
 │   ├── skillsmcp/              # MCP server for Agent Skills
 │   └── stakpak/                # DevOps AI agent for infrastructure automation
 └── README.md