curl -X PATCH https://api.arouter.ai/api/v1/keys/KEY_HASH \
-H "Authorization: Bearer lr_mgmt_xxxx" \
-H "Content-Type: application/json" \
-d '{
"name": "production-backend-v2",
"limit": 200,
"limit_reset": "monthly",
"allowed_providers": ["openai", "anthropic", "google"],
"allowed_models": ["openai/gpt-5.4", "anthropic/claude-sonnet-4.6", "google/gemini-2.5-flash"]
}'