Added GPT-5 Pro to Azure Cognitive Services

[opencode-agent]

Summary

I've successfully created the GPT-5 Pro model definition for both the Azure and Azure Cognitive Services providers. Here's what I accomplished:

1. Created the main model definition in /providers/azure/models/gpt-5-pro.toml with the following specifications:

   • Name: GPT-5 Pro
   • Release date: 2025-10-06
   • Context window: 400,000 tokens
   • Output limit: 272,000 tokens
   • Cost: $15.00 per million input tokens, $120.00 per million output tokens
   • Features: Supports attachments, reasoning, tool calls, structured output
   • Modalities: Text and image input, text output

2. Created a symlink in /providers/azure-cognitive-services/models/gpt-5-pro.toml that points to the Azure provider version, following the same pattern used by all other Azure Cognitive Services models.

The model specifications are based on the OpenAI GPT-5 Pro definition and are consistent with other GPT-5 family models in the codebase. The files are now properly set up and should resolve the issue mentioned in the GitHub issue about GPT-5 Pro not being available in Azure Cognitive Services.

Closes #395

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