Add Atlas Cloud provider preset

[binyangzhu000-sudo]

Summary

• add Atlas Cloud as a built-in OpenAI-compatible provider preset
• configure the default endpoint, ATLASCLOUD_API_KEY auth env var, and qwen/qwen3.5-flash default model
• add Atlas Cloud curated model picker entries for qwen/qwen3.5-flash and deepseek-ai/deepseek-v4-pro

Validation

• git diff --check
• Atlas Cloud live catalog check: 434 models returned; qwen/qwen3.5-flash and deepseek-ai/deepseek-v4-pro confirmed present
• Go tests not run locally because this machine does not have go/gofmt installed

No README or promotional sections were changed.

Summary by CodeRabbit

• New Features
  • Added Atlas Cloud as a supported OpenAI-compatible provider.
  • Added bundled models: Qwen 3.5 Flash and DeepSeek V4 Pro.
  • Added support for Atlas Cloud aliases, including “Atlas Cloud” and “Atlas”.
  • Configured authentication through the ATLASCLOUD_API_KEY environment variable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 481c1897-9817-4072-b0fb-af942b5bae87

📥 Commits

Reviewing files that changed from the base of the PR and between 3524f79 and 12c9e36.

📒 Files selected for processing (4)

• internal/providercatalog/catalog.go
• internal/providercatalog/catalog_test.go
• internal/providermodelcatalog/catalog.go
• internal/providermodelcatalog/catalog_test.go

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Walkthrough

Atlas Cloud is added to the provider catalog as an OpenAI-compatible provider and to the curated model catalog with two models. Tests cover descriptor metadata, aliases, ordering, and provider-scoped models.

Changes

Atlas Cloud provider integration

Layer / File(s)	Summary
Provider descriptor and catalog coverage internal/providercatalog/catalog.go, internal/providercatalog/catalog_test.go	Registers atlascloud with its API URL, default model, authentication variable, aliases, and OpenAI-compatible transport; tests verify metadata, normalization, and ordering.
Curated model registration and scoping coverage internal/providermodelcatalog/catalog.go, internal/providermodelcatalog/catalog_test.go	Adds qwen/qwen3.5-flash and deepseek-ai/deepseek-v4-pro for Atlas Cloud and verifies provider-specific inclusion and exclusion.Estimated code review effort: 2 (Simple)

Possibly related PRs

• Gitlawb/zero#388: Adds another OpenAI-compatible provider descriptor and related ordering tests.
• Gitlawb/zero#424: Follows the same provider descriptor and dedicated metadata test pattern.
• Gitlawb/zero#772: Adds an OpenAI-compatible provider with catalog and curated model updates.

Suggested reviewers: eli-l, kevincodex1, stanaiml

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding Atlas Cloud as a built-in provider preset.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jatmn]

@Vasanthdev2004 LGTM

[kevincodex1]

LGTM