add SaladCloud AI Gateway provider

[mgorkii-nlplogix]

Summary by cubic

Add saladcloud as an OpenAI-compatible provider for SaladCloud AI Gateway, with presets for Qwen 3.6/3.5 models and docs. Qwen “thinking” output is disabled by default, with an option to enable it.

• New Features
  • Core: added SaladCloud class (extends OpenAI) with apiBase https://ai.salad.cloud/v1/ and useLegacyCompletionsEndpoint: false; injects chat_template_kwargs.enable_thinking: false while preserving user overrides; registered in LLMClasses.
  • Tooling: added saladcloud to PROVIDER_TOOL_SUPPORT (allows tools for Qwen 3.5- and 3.6- models).
  • GUI: new saladcloud provider with API key input and presets:
    • Qwen 3.6 35B A3B (qwen3.6-35b-a3b, 262,144 context)
    • Qwen 3.6 27B (qwen3.6-27b, 262,144 context)
    • Qwen 3.5 9B (qwen3.5-9b, 262,144 context)
  • Docs: new SaladCloud page with API key link, model reference, YAML/JSON examples, note on enabling thinking via requestOptions.extraBodyProperties.chat_template_kwargs.enable_thinking; embeddings not supported.

^{Written for commit cc84364. Summary will update on new commits.}

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[mgorkii-nlplogix]

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[cubic-dev-ai]

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