feat(providers): add Baidu Qianfan Coding Plan for Claude Code

[jimmyzhuu]

What changed

• Added a Baidu Qianfan Coding Plan preset for Claude Code.
• Configured the preset to use the Anthropic-compatible Coding Plan endpoint:
  • https://qianfan.baidubce.com/anthropic/coding
• Set qianfan-code-latest as the default Claude Code model fields.
• Added stream-check classification for Qianfan Coding Plan quota-limit errors:
  • coding_plan_hour_quota_exceeded
  • coding_plan_week_quota_exceeded
  • coding_plan_month_quota_exceeded
• Added localized quota-exceeded health-check messaging.

Why this change is needed

Baidu Qianfan Coding Plan was not available as a Claude Code provider preset, so users had to manually enter the endpoint, token field, and model configuration.

This PR adds a focused Claude Code preset path for Qianfan Coding Plan while keeping OpenCode and OpenClaw support out of scope for now.

User impact

• Users can configure Baidu Qianfan Coding Plan for Claude Code from provider presets.
• qianfan-code-latest keeps the local model config stable while users manage the underlying Coding Plan model from the Qianfan console.
• Qianfan Coding Plan quota-limit responses now show a clearer quota-related health-check warning instead of falling through to a generic failure path.

Follow-up

OpenCode and OpenClaw support is tracked separately because those providers need full URL mode support for non-standard OpenAI-compatible endpoints:

• Enable full URL mode for OpenClaw and OpenCode providers #2358

Tests

• pnpm typecheck
• pnpm format:check
• cd src-tauri && cargo test test_detect_qianfan_coding_plan_quota_errors
• cd src-tauri && cargo fmt --check

[farion1231]

Could this preset be aligned with the existing file format? Its current structure differs quite a bit from the others.

[jimmyzhuu]

Hi Jason, aligned the Qianfan presets with the existing preset file style by inlining the config in each preset file and removing the shared preset metadata/tests. Also added the base URL template fields for OpenCode/OpenClaw to match nearby presets.

[farion1231]

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[chatgpt-codex-connector]

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[jimmyzhuu]

Hi Jason, I narrowed this PR to Claude Code support only and removed the Qianfan Coding Plan presets from OpenClaw and OpenCode for now.

Follow-up issue: #2358

[jimmyzhuu]

@farion1231 Hi Jason, just following up on this PR as it’s been almost a week. Could you please help review and merge it when you get a chance?😃

[farion1231]

Thank you for your contribution！