维护者确认: fix(model-providers): 修复自定义渠道模型 effort 识别

## 触发
- **类别**: arch
- **原因**: core-paths(核心路径改动 284 行 ≥ 150)
- **作者**: xia0ne

## 当前状态
- CI 失败: check:pr-design-basis / pr-design-basis
- 等 CI 修复后维护者 Approve 即可放行

## 确认方式
维护者请在 PR 上直接 Approve;需要修改请提 Request Changes,作者改完后重新 Approve 即放行。

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关联 PR:#2160(作者 @xia0ne);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的技术架构调整,维护者确认后 PR 会恢复推进。

Start by reviewing the linked PR #2160 and the failed check:pr-design-basis / pr-design-basis result; the issue does not name specific files or tests. Done means the CI check is fixed and a maintainer approves the architectural change, with any requested changes completed.

Written by the indexing model from the issue text.