Receive a NovoLogix prior authorization payload

Receive a prior authorization payload from NovoLogix.

Requires scope: novologix:write

Only the envelope and member id are modeled (see NovologixPriorAuthRequest); the auth-level body is not mapped yet. We log the raw request body — not payload.dict() — so unmodeled fields are captured for inspection, since Ninja's schema drops keys it doesn't declare even with extra="allow". Downstream processing will be added later.