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nfuller286 1147507d06 feat: Add Azure OpenAI chat completions provider (#4456 )

* feat: Add Azure OpenAI chat completions provider

This commit introduces comprehensive support for integrating Azure OpenAI as a new chat completion source within SillyTavern. The implementation specifically navigates Azure's reliance on deployment names, differing from standard model selection.

Includes:

- **New Feat / UI:** Dedicated settings in `public/index.html` for Azure parameters (Base URL, Deployment Name, API Version, API Key) and a new `public/img/azure_openai.svg` icon.
- **Frontend Logic (`public/scripts/openai.js`):** Manages Azure OpenAI settings and dynamic URL generation. The 'Connect' button triggers a `GET /models` endpoint call solely for API configuration validation (key, URL, version). Upon successful validation, a subsequent `POST` request is made to the AI, and the active model is extracted from its response payload, then populated for UI display (no direct user model selection).
- **Backend Logic (`src/endpoints/backends/chat-completions.js`):** Implements `sendAzureOpenAIRequest` to proxy requests, handling Azure’s unique authentication and URL structures. Enhanced the `/status` endpoint for Azure-specific validation.
- **Secret Management:** Secure handling of Azure OpenAI API keys in `public/scripts/secrets.js` and `src/endpoints/secrets.js`.
- **Autoconnect:** `public/scripts/RossAscends-mods.js` modified to enable automatic connection for Azure OpenAI if an API key is present.

Impact:
- Users can now connect to and utilize Azure OpenAI services.
- Requires new configuration details in the UI.
- Enhances API routing and validation with Azure-specific behavior.
- Navigates model handling: model name is *derived dynamically* from AI response, not directly selected, aligning with internal SillyTavern structure.

* fixed the html issues, openai.ujs and secrets.js

modified: public/index.html#
modified: public/scripts/openai.js
modified: public/scripts/secrets.js

* Extends Azure OpenAI with advanced capabilities

Enables advanced features such as function calling, image inlining, and model reasoning in the UI for Azure OpenAI.

Refactors the backend to support structured output (JSON mode), native thinking, and reasoning effort for compatible Azure OpenAI models. Adds support for logprobs, multiple responses (`n`), and seed, aligning with standard OpenAI behavior.

Improves request handling with a retry mechanism for rate limits and more robust error reporting. Ensures correct parameter handling for model-specific features and conflicts, such as when native thinking is enabled. Optimizes the Azure OpenAI status probe for efficiency.
modified: public/index.html
modified: public/scripts/openai.js
modified: src/endpoints/backends/chat-completions.js

* PR fixes
Simplification
Removed reasoning logic from backend
modified: src/endpoints/backends/chat-completions.js

modified: src/endpoints/backends/chat-completions.js

* Fix PR comments
Removed the front end compiled url UI element and related.
Misc simplifications
modified: public/index.html
modified: public/scripts/openai.js
modified: src/endpoints/backends/chat-completions.js

* Fixed accidental api temporary disabled
modified: public/index.html

* Don't transfer status code verbatim

* Fix formatting

* Enable tool calling

* Fix logo coloration

* Move model arrays to shared constants

* Fix capitalization

* Remove obsolete comment

* Improve response schema parameter format

* Fix tokenizer model selection

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Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>