Validate a patient event and return the generated HL7 message

Validate a patient event payload, generate its HL7 v2.x message, and send it. Parses the payload with ``PatientEvent.model_validate()`` and returns: - On success: ``{"valid": true, "data": ..., "version": ..., "hl7_message": ..., "segments": [...], "delivery": {...}}`` - On failure: ``{"valid": false, "errors": [<pydantic_validation_errors>]}`` When ``integration_configs`` carries a TCP/IP ``host``/``port`` (via ``config_meta`` or ``integration_details``), the generated message is also delivered over a plain TCP socket. Delivery is best-effort — an unreachable receiver or missing transport config is reported under ``delivery`` without failing the validation response.