feat: add login_style attribute to ory_project_config

[KT-Doan]

Description

Add support for toggling login flow style between unified and identifier_first via the login_style attribute on ory_project_config.

This maps to the API path /services/identity/config/selfservice/flows/login/style.

Related Issues

Fixes #87

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING guide
• My code follows the existing code style
• I have added tests that prove my fix/feature works
• I have updated documentation as needed
• All new and existing tests pass (make test)
• I have run the linter (make format)

Testing

• Unit tests — 3 new tests for buildPatches (identifier_first, unified, null)
• Acceptance tests — create, import, update, and no-diff verified against staging
• Manual testing — terraform plan, apply, import, destroy all verified
• API fix confirmed — PATCH persists login_style and GET returns updated value on both staging and production

What Changed

File	Change
resource.go	Added LoginStyle field to model, schema attribute with OneOf validator, buildPatches entry, readProjectConfig entry
build_patches_test.go	3 new unit tests for login_style patch generation
resource_test.go	New TestAccProjectConfigResource_loginStyle acceptance test
testdata/login_style.tf.tmpl	Test config template
examples/resources/ory_project_config/resource.tf	Example usage
templates/resources/project_config.md.tmpl	Added login flow to coverage table
docs/resources/project_config.md	Auto-regenerated

Usage

resource "ory_project_config" "main" {
  login_style     = "identifier_first"  # or "unified"
  enable_password = true
}

[Copilot]

Pull request overview

Adds a new optional login_style attribute to the ory_project_config Terraform resource, enabling configuration of Ory Kratos login flow style via the project config JSON Patch API.

Changes:

• Adds login_style to the project config resource model + schema (validated as unified or identifier_first) and maps it to /services/identity/config/selfservice/flows/login/style.
• Extends patch-building and project-config reading logic to write/read the login style.
• Adds unit + acceptance tests, updates docs/templates, and provides example + manual test configs.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/resources/projectconfig/resource.go	Adds LoginStyle field, schema attribute, JSON patch generation, and read-back into state.
internal/resources/projectconfig/build_patches_test.go	Unit tests verifying JSON Patch generation for login_style (identifier_first/unified/null).
internal/resources/projectconfig/resource_test.go	Adds acceptance coverage for create/import/update/no-diff behavior for login_style.
internal/resources/projectconfig/testdata/login_style.tf.tmpl	Acceptance test config template for login_style.
examples/resources/ory_project_config/resource.tf	Example showing identifier-first login configuration.
templates/resources/project_config.md.tmpl	Documents “Login flow” coverage category.
docs/resources/project_config.md	Regenerated docs including the new attribute and example snippet.
test/manual/login_style/main.tf	Manual test config for applying login_style.
test/manual/login_style/README.md	Manual test instructions for create/update/import/destroy workflow.

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

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