feat(azure_openai): add gpt-5.1 model support

[jdzgd]

Related Issues or Context

Add support for the gpt-5.1 reasoning model in the Azure OpenAI plugin so it can be used in Dify, consistent with the OpenAI plugin support for gpt-5.1.

This PR contains Changes to Non-Plugin

• Documentation
• Other

This PR contains Changes to Non-LLM Models Plugin

• I have Run Comprehensive Tests Relevant to My Changes

This PR contains Changes to LLM Models Plugin

• My Changes Affect Message Flow Handling (System Messages and User→Assistant Turn-Taking)

• My Changes Affect Tool Interaction Flow (Multi-Round Usage and Output Handling, for both Agent App and Agent Node)

• My Changes Affect Multimodal Input Handling (Images, PDFs, Audio, Video, etc.)

• My Changes Affect Multimodal Output Generation (Images, Audio, Video, etc.)

• My Changes Affect Structured Output Format (JSON, XML, etc.)

• My Changes Affect Token Consumption Metrics

• My Changes Affect Other LLM Functionalities (Reasoning Process, Grounding, Prompt Caching, etc.)

• Other Changes (Add New Models, Fix Model Parameters etc.)

Version Control (Any Changes to the Plugin Will Require Bumping the Version)

• I have Bumped Up the Version in Manifest.yaml (Top-Level Version Field, Not in Meta Section)

Dify Plugin SDK Version

• I have Ensured dify_plugin>=0.3.0,<0.6.0 is in requirements.txt (SDK docs)

Environment Verification (If Any Code Changes)

Local Deployment Environment

• Dify Version is:1.10.1 , I have Tested My Changes on Local Deployment Dify with a Clean Environment That Matches the Production Configuration.

SaaS Environment

• I have Tested My Changes on cloud.dify.ai with a Clean Environment That Matches the Production Configuration

[gemini-code-assist]

Summary of Changes

Hello @jdzgd, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive support for the gpt-5.1 reasoning model to the Azure OpenAI plugin. The primary goal is to enable Dify users to leverage this new model, ensuring feature parity and consistent configuration options with the existing OpenAI plugin. The changes involve defining the model's properties, parameters, and making it available for selection within the Dify platform.

Highlights

• New Model Support: Added support for the gpt-5.1 reasoning model within the Azure OpenAI plugin, aligning its capabilities and configuration with existing OpenAI plugin support.
• Model Definition: The gpt-5.1 model is now defined with specific features such as agent thought, multi-tool call, stream tool call, vision, and structured output, along with configurable parameters like response_format, json_schema, reasoning_effort, and verbosity.
• User Interface Integration: The gpt-5.1 model is now selectable as a base model option in the Azure OpenAI provider configuration, making it available for users in Dify.
• Version Update: The plugin version has been incremented from 0.0.30 to 0.0.31 in manifest.yaml to reflect these changes.

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[gemini-code-assist]

Code Review

This pull request adds support for the gpt-5.1 model to the Azure OpenAI plugin. The changes are consistent with the existing model definitions and the corresponding OpenAI plugin. I've found a couple of minor issues in the internationalization (i18n) strings for the new model definition that could be improved for better user experience. Specifically, a missing Chinese label and some grammatical improvements in the English help texts for model parameters. Overall, the changes are good and address the goal of the PR.