POST /v1/lead-scoring/score now evaluates in the request, applies an overall
AI deadline, and stores the completed run only after scoring. Idempotency is
kept by (app_id, account_id, request_id) with a body fingerprint.
Removes the webhook outbox, scheduler/recovery loop, app lead_scoring
permission, credential audit events, seed_demo and generate_secret scripts,
and the tests that covered them. Trims tests to behavior of the new flow.
