feat(ext): support structured output in AzureAIChatCompletionClient

[Siddhesh Kabra (Xsidz)]

Summary

Fixes #5957

Removes the TODO/raise-ValueError block in AzureAIChatCompletionClient._validate_model_info and replaces it with actual structured output support, mirroring the OpenAIChatCompletionClient pattern.

Change in _azure_ai_client.py:

• Imported JsonSchemaFormat from azure.ai.inference.models
• When json_output is a Pydantic BaseModel subclass, validates model_info["structured_output"] is True, then builds a JsonSchemaFormat from json_output.model_json_schema() and sets it as create_args["response_format"]
• The Azure AI Inference SDK's ChatCompletionsClient.complete() already accepts response_format: JsonSchemaFormat directly

Usage after this change:

from pydantic import BaseModel
from autogen_ext.models.azure import AzureAIChatCompletionClient

class Answer(BaseModel):
    value: int

client = AzureAIChatCompletionClient(
    endpoint="...", credential=...,
    model_info={"structured_output": True, "json_output": True, ...}
)
result = await client.create(messages=[...], json_output=Answer)

Test plan

• test_structured_output_raises_when_not_supported: verifies ValueError when model_info["structured_output"] is False
• test_structured_output_sets_json_schema_format: verifies JsonSchemaFormat is set with correct name and schema
• Full test_azure_ai_model_client.py: 20 passed, 0 failures

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