Added

Store global user attributes

Introduced a new POST endpoint at /attribute/{user_token} to store global user attributes for a given user.

• Accepts a request body containing values, an array of GlobalAttrValue objects.
• Supports an optional Idempotency-Key header to prevent duplicate processing.
• Returns 201 on successful creation.

Request (example)

{
  "values": [
    {
      "token": "e2ca24e9-c546-4c64-90d2-cb8e70e7c9ba",
      "value": "432532532",
      "type": "SocialSecurity"
    }
  ]
}