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
  • Expanded the list of supported OpenAI-compatible AI providers to include DaoXE.
  • Added DaoXE configuration guidance for a multi-protocol gateway setup.
  • Included an example Chat Completions YAML configuration with model, endpoint, and API key settings.
  • Documented account-scoped model identifiers and noted regional availability constraints.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: e3af57a2-46d9-45ab-80fb-9ba0f8573d4e

📥 Commits

Reviewing files that changed from the base of the PR and between 3accaf0 and 640ab0e.

📒 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 a multi-protocol gateway example with model, endpoint, API key, and regional availability guidance.

Changes

Chat Completions Documentation

Layer / File(s)	Summary
Provider support and DaoXE example massgen/configs/BACKEND_CONFIGURATION.md	Adds DaoXE to the supported-provider and base-URL lists, and documents account-scoped model IDs, configuration fields, API key export, and mainland-China availability.

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	It includes summary and test plan, but omits most required template sections like type of change, checklist, how to test, and expected results.	Add the missing template sections: type of change, checklist, pre-commit status, detailed how-to-test command, expected results, and additional context.

✅ Passed checks (7 passed)

Check name	Status	Explanation
Title check	✅ Passed	Matches the PR’s docs-only change and follows the required docs: format.
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 updates the existing backend configuration docs in massgen/configs/BACKEND_CONFIGURATION.md with DaoXE support and a matching YAML example, which fits the required docs location.
Capabilities Registry Check	✅ Passed	Only BACKEND_CONFIGURATION.md changed; no massgen/backend or token_manager code updates were detected, so the capabilities-registry check is not applicable.
Config Parameter Sync	✅ Passed	Only BACKEND_CONFIGURATION.md changed; DaoXE uses existing keys and both exclusion methods already share the same source list.

✨ 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

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

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.