Add: Submodel Provider support

[OPAI-OP]

Context

This PR adds the Submodel provider. Submodel offers a wide range of inference model services at competitive prices, with some models providing users with a daily free quota of 1M tokens or 200 requests.

Implementation

Core Integration Components:

1. Dynamic Model Fetcher (src/api/providers/fetchers/submodel.ts)

• /v1/models fetches real-time models from the Submodel endpoint.
• Smart context window inference based on model name patterns.
• Graceful fallback to static models if the API fails.

2. WebView Message Handler Integration

• webviewMessageHandler.ts is updated to include CometAPI in the router model fetch.
• Proper authentication and error handling for API requests.

Screenshots

before	after
Submodel was not supported.	Submodel is supported.

How to Test

1. Setup SubModel Integration:

• Go to Settings → API Providers
• Select "SubModel" from the provider dropdown
• Enter your CometAPI key from https://submodel.ai/#/account/others?tab=llm_token

2. Verify Dynamic Model Loading:

• Model dropdown should populate models

3. Test Model Selection:

• Select a model from the filtered list
• Verify the selected model appears in the bottom-left corner of the main interface
• Create a new task and confirm the selected Submodel is used

4. Test Error Handling:

• Try with an invalid API key - should show error status "401 Invalid API key"
• Try without network connection - should gracefully handle failures

Get in Touch

Website: https://submodel.ai
Email: [email protected]
Discord: @masonf7695

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[OPAI-OP]

I'd be grateful if teams could take a look this PR and provide your feedback when you have a moment.

Thanks so much for your time and help!