Add Atlas Cloud provider preset

[binyangzhu000-sudo]

Summary

• Add Atlas Cloud as a built-in OpenAI-compatible provider preset.
• Seed the preset with https://api.atlascloud.ai/v1, API-key auth, and live-verified default models.
• Cover exact preset matching, catalog defaults, and runtime compatibility in the provider preset tests.

Tests

• git diff --check
• npx tsx --test src/__tests__/unit/provider-preset.test.ts (106 passed)
• npx tsx --test src/__tests__/unit/provider-icon-rule.test.ts (16 passed)
• npx eslint src/lib/provider-catalog.ts src/__tests__/unit/provider-preset.test.ts (passes with one existing _role warning in provider-catalog.ts)
• Atlas live /v1/models check returned 118 models and confirmed qwen/qwen3.5-flash plus deepseek-ai/deepseek-v4-pro

Notes

• npm ci is currently blocked by an upstream package-lock mismatch (@electron/windows-sign, cross-dirname, fs-extra, etc. missing from lockfile). I used npm install --package-lock=false --ignore-scripts for local dependency install and did not modify the lockfile.
• Full npm run typecheck currently fails in unrelated existing component files (src/components/ai-elements/*, DevOutputChips.tsx, UsageStatsSection.tsx), not in the changed provider catalog files.

README / marketing compliance

• No README changes
• No sponsor, logo, credits, or partner promotion added

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[binyangzhu000-sudo]

Thanks. I pushed follow-up commit eb9113a69eab8eb2fda168c2154937394c1b7508 resolving the current merge conflict.

What changed:

• Merged latest main into the PR branch.
• Resolved src/lib/provider-catalog.ts by keeping both the existing Atlas Cloud preset and the new upstream xAI preset.
• Updated the Atlas Cloud preset test record shape to include preset_key and protocol, matching the current provider identity type.
• Kept the net PR diff against main limited to provider-catalog.ts and provider-preset.test.ts.

Validation:

• npm install --package-lock=false --ignore-scripts --no-audit --no-fund
• npm rebuild better-sqlite3
• CODEX_DISABLED=1 npx tsx --test --import ./src/__tests__/db-isolation.setup.ts src/__tests__/unit/provider-preset.test.ts — 112 tests passed
• npx eslint src/lib/provider-catalog.ts src/__tests__/unit/provider-preset.test.ts — 0 errors, 1 existing warning in provider-catalog.ts for _role
• git diff --check origin/main...HEAD

Notes:

• npm ci is currently blocked locally because package.json and package-lock.json are out of sync for Electron signing dependencies after the upstream merge.
• npm run typecheck still reports unrelated upstream UI typing errors in src/components/ai-elements/* and src/components/settings/UsageStatsSection.tsx; the Atlas Cloud test record type errors are fixed.
• No paid Atlas live POST was run.