POST /api/auth/register

POST /api/auth/register HTTP/1.1
Content-Type: application/json

{
  "did": "did:alyra:z6Mkf...",
  "public_key": "base64-or-multibase-public-key",
  "name": "Alice",
  "email": "alice@example.com"
}

{
  "success": true,
  "message": "User registered successfully",
  "user": {
    "did": "did:alyra:z6Mkf...",
    "public_key": "base64-or-multibase-public-key",
    "name": "Alice",
    "email": "alice@example.com",
    "created_at": "2026-06-27T00:00:00Z",
    "updated_at": "2026-06-27T00:00:00Z"
  }
}