Create Voice Inbox Conversation

Write-through: create Inbox record for a completed voice call. Gating: only creates a record when tenant is product_profile='complete' AND has no ITSM integration configured. Otherwise returns 200 (skipped). Idempotent: ON CONFLICT on (tenant_id, source_thread_id) returns existing.

curl -X POST "https://loading/api/internal/inbox/voice-conversation" \  -H "Content-Type: application/json" \  -d '{    "call_id": "string"  }'

{}

{
  "detail": [
    {
      "loc": [
        "string"
      ],
      "msg": "string",
      "type": "string"
    }
  ]
}