feat: integrate GitHub Copilot as third LLM provider via copilot-bridge
Add GitHub Copilot API proxy integration to LLM Gateway:
* Implement copilot-bridge service:
- HTTP wrapper managing copilot-api (GitHub Copilot API proxy)
- OpenAI-compatible /v1/chat/completions endpoint (port 3252)
- Graceful startup and SIGTERM shutdown handling
- Health check endpoint with service diagnostics
* Register copilot-bridge in provider fallback chain:
- Position: After OpenAI, before free LLM APIs (tier 4)
- Rate limit: 60 requests/min (GitHub Copilot API limit)
- Models: gpt-4 (reasoning), gpt-3.5-turbo (medium)
- Authentication: GitHub Copilot subscription (internal to copilot-api)
* Update PM2 ecosystem configuration:
- Add copilot-bridge service definition (port 3252)
- Configure COPILOT_BRIDGE_URL in gateway environment
- Add copilot to LLM_PROVIDERS list
* Enhance deployment automation:
- Update ensure-bridges.sh with copilot-bridge deployment
- Copy service files from repo to /opt/copilot-bridge
- Run npm install for copilot-api dependency
* Comprehensive documentation:
- Expand DEPLOYMENT-BRIDGES.md with copilot-bridge section
- Prerequisites: Node.js 20+, GitHub Copilot subscription
- Authentication workflow: npm run auth with GitHub OAuth
- Troubleshooting: subscription verification, auth cache reset
Provider chain now supports:
1. Ollama (local, free)
2. claude-bridge (Claude subscription)
3. openai-bridge (OpenAI subscription)
4. copilot-bridge (GitHub Copilot subscription) ← NEW
5. Free APIs: Cerebras, Groq, Mistral, NVIDIA, Cloudflare
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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