Bug: portkey_integration fails to refresh state due to JSON unmarshaling error (is_custom type mismatch)

[tyleris-irish]

Description

When running a terraform plan or refresh, the portkey_integration resource fails if the integration contains custom models. The provider encounters a fatal error while trying to unmarshal the API response because it expects a bool for the is_custom field, but receives a number.

Expected Behavior

The provider should successfully refresh the state of the integration, regardless of whether custom models exist in the Portkey dashboard, or it should correctly handle the conversion of 0/1 to false/true.
Actual Behavior:

The plan fails with the following error:

Error: Error reading integration models
  with portkey_integration.AIF_PKYGENERAL_ANTHROPIC,
  on main.tf line 32, in resource "portkey_integration" "AIF_PKYGENERAL_ANTHROPIC":
  32: resource "portkey_integration" "AIF_PKYGENERAL_ANTHROPIC" {

Could not read integration models: error unmarshaling response: json: cannot 
unmarshal number into Go struct field IntegrationModel.models.is_custom of 
type bool

Steps to Reproduce:

1. Create an Azure Foundry portkey_integration with no models
2. Manually add a "Custom Model" to an AI Foundry integration via the Portkey UI.
3. Run terraform plan.
4. The provider will attempt to refresh the integration state, fetch the model list, and fail when parsing the is_custom field.

[tyleris-irish]

Lol I guess something weird with deploying models is consistent because I came here to open an issue, forgetting I did already 3 months ago. This is what my code looks like this time around, but getting a different error.

resource "portkey_integration" "CLUSTER" {
  name             = "Cluster"
  slug             = "cluster"
  description      = "Managed by Terraform. Local compute models served at the Advanced Research Computing Center (ARCC)."
  ai_provider_id   = "openai"
  allow_all_models = false
  configurations = jsonencode({
    custom_host = "http://[REDACTED]/v1"
  })
}

resource "portkey_integration_model_access" "gemma-4-31b-it" {
  integration_id = portkey_integration.CLUSTER.slug
  model_slug     = "gemma-4-31b-it"
  is_custom      = true
  is_finetune    = false
  enabled        = true
}

│ Error: Provider produced inconsistent result after apply
│ 
│ When applying changes to portkey_integration_model_access.gemma-4-31b-it,
│ provider "provider[\"registry.terraform.io/portkey-ai/portkey\"]" produced
│ an unexpected new value: .is_custom: was cty.True, but now cty.False.
│ 
│ This is a bug in the provider, which should be reported in the provider's
│ own issue tracker.