feat(provider): add TokenLab

[hedging8563]

Summary

• add TokenLab to the default provider list
• configure TokenLab as an OpenAI-compatible provider at https://api.tokenlab.sh/v1
• use a small generate-text key check with gpt-5.4-mini
• add the TokenLab provider icon and ModelIcon coverage

Notes

TokenLab also exposes native Responses, Anthropic Messages, and Gemini-compatible endpoints. This PR keeps the default DeepChat integration on the existing OpenAI-compatible path so users can fetch the live model list from /v1/models without extra provider-specific code.

Testing

• corepack pnpm run format
• corepack pnpm run i18n
• corepack pnpm run lint
• corepack pnpm exec vitest --config vitest.config.renderer.ts test/renderer/components/ModelIcon.test.ts
• git diff --check

Summary by CodeRabbit

• New Features
  • Added support for a new AI provider option, TokenLab.
  • TokenLab is now available in provider selection and can be resolved like existing providers (including default check settings).
  • Added TokenLab’s official endpoint and related website links for easier setup and reference.
  • Added a TokenLab model icon to the UI model/icon mapping.
• Tests
  • Updated ModelIcon tests to cover the TokenLab icon rendering.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds TokenLab as a supported provider, wires its provider definition into resolution, and adds renderer icon mapping plus test coverage for the new tokenlab model ID.

Changes

TokenLab provider and icon support

Layer / File(s)	Summary
Register TokenLab provider src/main/presenter/configPresenter/providers.ts, src/main/presenter/llmProviderPresenter/providerRegistry.ts	Adds TokenLab to DEFAULT_PROVIDERS and registers tokenlab in PROVIDER_ID_REGISTRY with OPENAI_BASE, generate-text checking, API-key credentials, and fixed check parameters.
Map TokenLab icon and test it src/renderer/src/components/icons/modelIconRegistry.ts, test/renderer/components/ModelIcon.test.ts	Adds the TokenLab icon asset to modelIcons and extends the ModelIcon test to render tokenlab and assert the expected icon URL.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related issues

• [bug] TokenLab provider icon missing #1904: Matches the added TokenLab icon mapping and its test coverage.

Possibly related PRs

• ThinkInAIXYZ/deepchat#1041: Adds another provider entry to DEFAULT_PROVIDERS using the same provider-list extension pattern.
• ThinkInAIXYZ/deepchat#1388: Updates the same provider/icon integration points for another built-in provider.
• ThinkInAIXYZ/deepchat#1481: Extends DEFAULT_PROVIDERS and PROVIDER_ID_REGISTRY with a new provider ID, similar to this change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding TokenLab as a provider.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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