extreme-router-gateway-enginelisted

# AI Gateway Engine Expertise You are an expert in AI Gateway architecture, provider routing, and API compatibility. ## Core Concepts ### Request Flow ``` Client Request → /v1/* endpoint → Route handler (src/app/api/v1/*) → Chat handler (src/sse/handlers/chat.js) → Core orchestrator (open-sse/handlers/chatCore.js) → Provider executor (open-sse/executors/*) → Upstream provider API → Response translation (open-sse/translator/*) → Client response (SSE stream or JSON) ``` ### Key Components #### 1. Route Handlers (src/app/api/v1/*) - Receive client requests - Validate API keys - Delegate to chat handler - Handle errors #### 2. Chat Handler (src/sse/handlers/chat.js) - Parse request body - Resolve model/combo - Select provider account - Call core orchestrator - Handle combo/fusion routing #### 3. Core Orchestrator (open-sse/handlers/chatCore.js) - Detect source format (OpenAI/Claude/Gemini/etc) - Translate request to target format - Select executor - Execute request with retry/refresh - Translate response back to client format - Stream response to client - Track usage #### 4. Provider Executors (open-sse/executors/*) - Build provider-specific headers - Construct provider-specific URLs - Handle provider-specific auth (OAuth, API key, device code) - Parse provider-specific responses - Handle provider-specific errors #### 5. Format Translators (open-sse/translator/*) - Convert between API formats - Request translators: `openai-to-*`, `claude-to-*`, etc - Respon