docs: add DaoXE OpenAI-compatible gateway example

[seven7763]

Summary

• Document using DaoXE (multi-model multi-protocol API gateway) with Potpie via the existing OpenAI path: LLM_PROVIDER=openai + LLM_API_BASE=https://daoxe.com/v1 and OPENAI_API_KEY set to the DaoXE key.
• Place the example next to the existing Ollama note in legacy/README.md (docs-only; no runtime changes).
• Clarify optional LLM_API_BASE in legacy/.env.template.
• Model IDs are account-scoped — placeholders / authenticated GET /v1/models only (no hardcoded public catalog).
• Note multi-protocol scope (Chat Completions for this Potpie path; DaoXE also exposes other routes such as Anthropic Messages for clients that speak those APIs).
• Note service availability outside mainland China.
• Links: https://daoxe.com · https://daoxe.com/pricing · https://github.com/seven7763/DaoXE-AI

Potpie already reads LLM_API_BASE into provider config (LLMProviderConfig / LiteLLM base_url) for OpenAI-compatible endpoints.

Disclosure

I am affiliated with DaoXE.

Test plan

• README renders the new note under AI / LLM configuration
• Example env keys match legacy/.env.template (LLM_PROVIDER, OPENAI_API_KEY, CHAT_MODEL, INFERENCE_MODEL, LLM_API_BASE)
• Links resolve (daoxe.com, DaoXE-AI, pricing)
• Optional live check with a real OPENAI_API_KEY (DaoXE key) and account-scoped model IDs (no credentials in this PR)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3164a673-b38e-4e58-810b-06922c00642c

📥 Commits

Reviewing files that changed from the base of the PR and between d9bd564 and 63dd26a.

📒 Files selected for processing (2)

• legacy/.env.template
• legacy/README.md

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Added guidance for configuring an OpenAI-compatible gateway.
  • Documented account-scoped model IDs and regional availability considerations.
  • Included environment variable examples and clarified supported protocol routes.

Walkthrough

Changes

DaoXE gateway documentation

Layer / File(s)	Summary
Gateway configuration guidance legacy/.env.template, legacy/README.md	Adds DaoXE OpenAI-compatible gateway instructions, including LLM_API_BASE, LLM_PROVIDER, account-scoped model IDs, and protocol routing notes.

Possibly related PRs

• potpie-ai/potpie#599: Related LLM configuration guidance for LLM_API_BASE and model selection variables.
• potpie-ai/potpie#897: Related updates to legacy installation and environment-variable documentation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the docs-only DaoXE OpenAI-compatible gateway example added in the README and env template.
Description check	✅ Passed	The description matches the changes by documenting DaoXE setup, model IDs, and the optional env var clarification.
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.

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