Perplexity AI authentication

Perplexity AI uses the generic_api_key connection field

The current perplexityai toolkit uses API-key authentication. Create the key in Perplexity's console and provide it as generic_api_key during connection initiation. The key is shown once by the provider, so store it in the customer's secret manager and never send it to support.

If a first-party Perplexity tool succeeds but an equivalent Proxy Execute call returns 401 with the same connection, collect both Log IDs and the redacted request path. That comparison distinguishes a proxy auth-injection problem from an invalid provider key without asking the customer to rotate a working key.