docs: add DaoXE OpenAI-compatible Chat Completions backend example

[seven7763]

Summary

• Document DaoXE multi-model multi-protocol gateway under Chat Completions backends (base_url: https://daoxe.com/v1).
• Account-scoped model IDs; not available in mainland China.

Test plan

• Docs render
• Matches existing chatcompletion backend pattern

Disclosure: I am affiliated with DaoXE.

Summary by CodeRabbit

• Documentation
  • Added DaoXE as a supported Chat Completions provider at https://daoxe.com/v1.
  • Added a DaoXE configuration example with account-scoped model IDs.
  • Documented OPENAI_API_KEY usage and the optional OPENAI_BASE_URL environment variable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 640ab0e and 377e74b.

📒 Files selected for processing (1)

• massgen/configs/BACKEND_CONFIGURATION.md

🚧 Files skipped from review as they are similar to previous changes (1)

• massgen/configs/BACKEND_CONFIGURATION.md

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📝 Walkthrough

Walkthrough

The Chat Completions backend documentation now lists DaoXE and includes account-scoped model IDs, YAML configuration, API-key handling, and an optional base URL.

Changes

Chat Completions Documentation

Layer / File(s)	Summary
Provider support and DaoXE example massgen/configs/BACKEND_CONFIGURATION.md	Adds DaoXE to the Chat Completions base URL list and documents its model IDs, YAML configuration, OPENAI_API_KEY usage, and optional OPENAI_BASE_URL export.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description summarizes the change but omits required sections for change type, checklist, pre-commit status, testing commands, and expected results.	Complete the repository template sections, including the change type, checklist, pre-commit output, test command, and expected results.

✅ Passed checks (7 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses the required docs: format and clearly describes the DaoXE backend documentation added.
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.
Documentation Updated	✅ Passed	The PR changes only massgen/configs/BACKEND_CONFIGURATION.md and documents the existing generic chatcompletion path; it adds no new code, YAML option, model, function, or architecture requiring oth...
Capabilities Registry Check	✅ Passed	PR diff changes only BACKEND_CONFIGURATION.md. DaoXE uses the existing generic chatcompletion backend; capabilities.py and token_manager.py are unchanged, so the conditional registry check is inapp...
Config Parameter Sync	✅ Passed	The PR changes only documentation and reuses existing YAML keys (type, model, base_url, api_key); it adds no new YAML parameter, so the sync condition does not apply.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@massgen/configs/BACKEND_CONFIGURATION.md`:
- Around line 368-381: The DaoXE example incorrectly implies automatic
DAOXE_API_KEY fallback when api_key is omitted. Update the example text around
the DaoXE backend configuration to document only the environment-variable
fallback actually supported by backend resolution, using OPENAI_API_KEY if that
is the existing fallback; otherwise explicitly add DAOXE_API_KEY support before
retaining it.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 5002b6d0-6a76-411b-a9dc-9244373681f3

📥 Commits

Reviewing files that changed from the base of the PR and between 007bd85 and 3accaf0.

📒 Files selected for processing (1)

• massgen/configs/BACKEND_CONFIGURATION.md

[seven7763]

Addressed the CodeRabbit note in 640ab0e:

• DaoXE example no longer implies a special DAOXE_API_KEY auto-fallback.
• Documents the Chat Completions backend’s actual fallback (OPENAI_API_KEY) and shows an explicit export.

[seven7763]

Trimmed this down on my own initiative.

The PR was editing the Supports: line to slot DaoXE in among Cerebras / Together / Fireworks / Groq / OpenRouter / Moonshot. That line is a summary of the providers this backend is known for, and adding a new name to it does nothing for a reader who isn't already looking for it. Removed in 377e74b.

What's left is the base-URL reference entry and the worked YAML example, so the diff is now purely additive at 23 lines and touches no existing content. The example still carries the correction from the earlier CodeRabbit round: this backend falls back to OPENAI_API_KEY rather than any provider-specific variable, and the config makes that explicit instead of implying a fallback that doesn't exist.

Disclosure: I work on daoxe. Happy to trim further or close it if this isn't the kind of example you want in the backend docs.