feat(providers): add Astraflow (UCloud) OpenAI-compatible provider

[diegosouzapw]

Summary

• Adds Astraflow (UCloud) as an OpenAI-compatible, BYOK API-key provider pair: astraflow (global) and astraflow-cn (China), following the existing minimax/minimax-cn global+CN pattern.
• Both entries use passthroughModels: true with an empty seed model list (no fixed catalog; matches the vendor's "OpenAI-compatible platform" positioning without hardcoding a specific model count).
• Auth: bearer API key, format: "openai", executor: "default".

Base URL note

Base URLs are the vendor's inference domains (resolved behind UCloud's own edge WAF, *.uewaf.com), not the astraflow.ucloud-global.com / astraflow.ucloud.cn marketing sites:

• Global: https://api-us-ca.umodelverse.ai/v1/chat/completions
• China: https://api.modelverse.cn/v1/chat/completions

Both domains resolve via DNS to UCloud WAF infrastructure, which is a strong signal they are legitimate UCloud-operated endpoints. Direct HTTP validation could not be completed from this sandbox (no outbound network egress to arbitrary hosts). Best-effort — verify at first use.

Attribution

Thanks to @ucloudnb666

Changes

• src/shared/constants/providers/apikey/gateways.ts — astraflow + astraflow-cn gateway metadata (color #0052D9, websites).
• open-sse/config/providers/registry/astraflow/index.ts + open-sse/config/providers/registry/astraflow-cn/index.ts — registry entries.
• open-sse/config/providers/index.ts — wires both entries into the registry map.
• src/shared/constants/config.ts — PROVIDER_ENDPOINTS display entries for both.
• CHANGELOG.md — [3.8.44] New Features entry.
• tests/unit/astraflow-provider.test.ts — new test file.

Test plan

• node --import tsx/esm scripts/check/check-provider-consistency.ts → OK (173 REGISTRY entries, 245 canonical providers, 0 exceptions)
• node --import tsx/esm --test tests/unit/astraflow-provider.test.ts → 5/5 passing
• npm run typecheck:core → clean
• npm run check:cycles → OK, no cycles

[gemini-code-assist]

Warning

You have reached your daily quota limit. Please wait up to 24 hours and I will start processing your requests again!

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[diegosouzapw]

Closing: Astraflow (astraflow/astraflow-cn) was previously added (PR #2486) and deliberately removed (PR #3054, 2026-06-02) as a dead/unreachable provider — its API endpoints returned 000/404/empty on HTTP probe. Re-verification during this port also got HTTP 404 on the inference paths. Re-adding a provider that was intentionally removed for being non-functional would be a regression. Reopen only with a live confirmation (working key hitting /v1/chat/completions) that the endpoints are back up.