feat: add Atlas Cloud provider preset

[binyangzhu000-sudo]

Summary

• add Atlas Cloud to the built-in AI provider preset catalog
• configure its OpenAI-compatible Chat Completions endpoint and default model
• register the routed model semantics and keep credential injection defaults aligned

Verification

• pnpm exec vitest run src/ai-providers/preset-catalog.spec.ts src/ai-providers/model-semantics.spec.ts src/workspaces/cli/shim.spec.ts services/uta/src/domain/trading/brokers/presets.spec.ts (80 passed)
• pnpm exec tsc --noEmit
• full pnpm test: 3828 passed, 9 skipped; two unrelated tests timed out under the full parallel run and passed when rerun in the focused set; the catalog-contract failure found by the full run was fixed before the focused rerun
• parsed the preset and used its endpoint/model with the OpenAI client against the live Atlas Cloud API (123 models; default model present; chat completed)
• git diff --check

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