fix(providers): correct Qwen OpenAI-compatible base URL path to /compatible-mode/v1

[andrei-hasna]

Summary

The Qwen (Alibaba Model Studio) OpenAI-compatible base URL used the DashScope Application/RAG API prefix (/api/v2/apps/protocols/) instead of the Chat Completions compatible-mode path.

Per official Alibaba docs (Call Qwen models via OpenAI API, checked 2026-07-05), the OpenAI-compatible base path is /compatible-mode/v1. The correct region-agnostic international endpoint is:

https://dashscope-intl.aliyuncs.com/compatible-mode/v1

Decision

Kept the legacy dashscope-intl domain as the zero-config default. Alibaba recommends (does not require) migrating to workspace-specific domains (https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/compatible-mode/v1), but those need a per-user {WorkspaceId} placeholder and therefore cannot be a default; the legacy domain remains fully functional. Advanced users can still override via config.toml model_providers.

Changes

• codex-rs/model-provider-info/src/lib.rs: QWEN_BASE_URL → https://dashscope-intl.aliyuncs.com/compatible-mode/v1
• codex-rs/known-provider-models/src/lib.rs: QWEN_BASE_URL → same value (kept byte-identical)

Validation

• cargo test -p codex-model-provider-info -p codex-known-provider-models -p codex-model-provider — 66 + 16 + 64 passed, 0 failed
• cargo clippy -p codex-model-provider-info -p codex-known-provider-models --all-targets — clean
• grep -rn 'api/v2/apps/protocols' — no remaining occurrences

Task: eb7606a1-597e-4588-9a00-cda6c188f696

🤖 Generated with Claude Code

[andrei-hasna]

[codewith] Merge review update for task 956c88bf:

• Refreshed the PR branch with current main; new head is 4494e21.
• PR diff against main remains scoped to the two Qwen provider constants: codex-rs/model-provider-info/src/lib.rs and codex-rs/known-provider-models/src/lib.rs.
• Focused local validation passed on the refreshed head:
  • cd codex-rs && just test-fast -p codex-model-provider-info: 66 passed
  • cd codex-rs && just test-fast -p codex-known-provider-models: 16 passed
• Independent adversarial review found the Qwen /compatible-mode/v1 path defensible and constants synchronized.
• Not merged yet: refreshed CI is red due current-main blockers unrelated to this PR diff:
  • ci / build-test: verify_tui_core_boundary flags codex-rs/tui/src/chatwidget/settings_popups.rs:201 for codex_core text
  • Codespell: codex-rs/tui/src/chatwidget/settings_popups.rs:202 pre-selected => preselected
  • Bazel Linux / rust-ci format failures are still settling but match the existing current-main CI blocker task d8a3e575 and repair task 7ef5ed37.

Final merge should use squash/reword so the original commit's Co-Authored-By trailer is not carried into main.

[andrei-hasna]

Closing as superseded by #207. Replacement #207 carries the current provider/docs cleanup slice and explicitly lists this PR in its carried scope. Please continue review on #207.