Fix ai_provider_azure settings schema to match actual configuration structure

Problem/Motivation

The configuration schema defined in ai_provider_azure.schema.yml does not match the actual structure of the stored ai_provider_azure.settings configuration.

Currently, the schema defines a nested profile key, however, the actual configuration stored by the module has no profile key. As a result, schema validation tools report missing or invalid schema definitions for otherwise valid configuration.

Steps to reproduce

1. Install and enable the AI Provider Azure module.
2. Inspect the stored configuration: config:get ai_provider_azure.settings
3. Compare the configuration structure with the schema defined in ai_provider_azure.schema.yml.
4. Observe that the schema defines a profile key that does not exist in configuration.

Proposed resolution

I am providing a patch which updates the configuration schema to accurately reflect the configuration structure used by the module:

• Changes the schema type to config_object
• Removes the unused profile mapping
• Defines the top-level data key as a string

This brings the schema in line with the configuration actually written by the module.

Remaining tasks

Review the patch.

User interface changes

API changes

Data model changes