Add Atlas Cloud LLM provider preset

[binyangzhu000-sudo]

User description

Summary

• add Atlas Cloud to the existing LLM provider presets in settings
• prefill the OpenAI-compatible base URL and Qwen3.5 Flash model placeholder while keeping the API key user-provided
• add localized provider labels and a focused preset regression test

Validation

• npx tsx src/pages/settings/ProvidersSection.test.ts
• npm run build
• git diff --check
• Atlas live catalog returned qwen/qwen3.5-flash and deepseek-ai/deepseek-v4-pro

README: no README changes; no sponsor/logo/credits/partner promotion.

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PR Type

Enhancement, Tests

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Description

• Add Atlas Cloud LLM provider preset

• Update locale translations for all supported languages

• Add regression test for preset configuration

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File Walkthrough

	Relevant files
Localization	5 files en.ts Add Atlas Cloud locale entry for English                                  +1/-0      ja.ts Add Atlas Cloud locale entry for Japanese                                +1/-0      ko.ts Add Atlas Cloud locale entry for Korean                                    +1/-0      zh-CN.ts Add Atlas Cloud locale entry for Simplified Chinese            +1/-0      zh-TW.ts Add Atlas Cloud locale entry for Traditional Chinese          +1/-0
Enhancement	1 files ProvidersSection.tsx Add Atlas Cloud LLM preset and export presets array            +7/-1
Tests	1 files ProvidersSection.test.ts Add regression test for Atlas Cloud preset                              +15/-0

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[github-actions]

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🧪 PR contains tests

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