feat: agent node

backend/.env.example

@@ -0,0 +1,14 @@
+# Optional: backend env vars. Copy to .env and adjust.
+
+# --- Agent (AI) ---
+# For OpenAI: set your key (model defaults to gpt-4o-mini).
+# OPENAI_API_KEY=sk-...
+
+# For local LLM (LM Studio, Ollama, etc.): set base URL. No API key required.
+# AI_BASE_URL=http://localhost:1234/v1
+# Optional: model name (LM Studio shows the loaded model id).
+# AI_MODEL=local-model
+
+# --- Server ---
+# PORT=8080
+# CORS_ORIGIN=http://localhost:3000