refactor(ocpp): add rawPayload bypass, resolve minimal params in buildRequestPayload...

refactor(ocpp): add rawPayload bypass, resolve minimal params in buildRequestPayload, fix test types

Add rawPayload option to RequestParams for offline queue replay to
explicitly bypass buildRequestPayload instead of heuristic detection.

Make buildRequestPayload resolve missing TransactionEvent fields from
station context (connectorId from evse, transactionId generation,
triggerReason defaults) so the broadcast channel passthrough works.

Remove pre-built payload guard from OCPP 1.6 STATUS_NOTIFICATION.

Replace Record<string, unknown> downgrades in tests with proper OCPP
types (Partial<OCPP20TransactionEventRequest>, RequestParams).