fix(js/compat-oai): Fix handling slashes in model name

[ssbushi]

Fixes: #3846

Also consolidates how we treat *Ref helpers (if the helper name specifies a provider, then it needn't be specified in the name field)

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested)

[gemini-code-assist]

Summary of Changes

Hello @ssbushi, 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 significantly improves the robustness and consistency of model name handling within the js/compat-oai plugin. By introducing a dedicated utility function for parsing model names and streamlining the *Ref helper functions, it resolves an issue where slashes in model names were not correctly processed. This change simplifies model registration and ensures that model identifiers are consistently interpreted, making the plugin more reliable and easier to extend.

Highlights

• Introduced toModelName Utility: A new utility function toModelName was added to js/plugins/compat-oai/src/utils.ts to standardize the extraction of model names, correctly handling various prefixes (e.g., '/model/', '/embedder/') and custom plugin prefixes.
• Consolidated Model Naming Logic: The way model names are processed and registered has been unified across audio, embedder, image, and model definitions within the compat-oai plugin, ensuring consistent handling of slashes and prefixes.
• Refactored *Ref Helpers: Helper functions like openAIImageModelRef and xaiImageModelRef were refactored to automatically inject the provider namespace (e.g., 'openai', 'xai') when defining model references, removing the need for explicit prefixes in model names (e.g., 'openai/gpt-4' becomes 'gpt-4').
• Updated Model Definitions: Numerous model definitions across deepseek, openai, and xai sub-plugins were updated to reflect the new model naming convention, removing redundant provider prefixes from their name fields.
• Enhanced Test Coverage: New unit tests were added for the toModelName utility in js/plugins/compat-oai/tests/utils_test.ts to validate its behavior with different prefix scenarios and model names containing slashes.

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[gemini-code-assist]

Code Review

This pull request introduces a toModelName utility function to correctly handle slashes in model names and consolidates the logic for *Ref helpers to manage provider namespaces automatically. These changes significantly improve code clarity and maintainability by centralizing model name parsing and reducing redundancy. The overall approach is solid, but I've identified a potential issue in the new utility function that could lead to incorrect behavior in some edge cases. My feedback includes a suggestion to make the implementation more robust.