feat(api):add missing space case

[LingyeNBird]

Case3: expect 问题=缺少: 后空格

Close #11

[github-actions]

❌ PR 标题校验失败

::error title=PR 标题校验失败::缺少: 后空格
PR标题格式：type(scope): subject 或 type: subject
当前PR标题：feat(api):add missing space case
问题：缺少: 后空格

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Use a title that actually targets the missing-space branch

This fixture does not exercise the scenario described in the commit message: case 3 contains no colon, so the validator in .github/workflows/pr-title-check.yml fails earlier at the colon_index == -1 check ("缺少type") and never reaches the ": " spacing checks. If this file is meant to represent the "缺少: 后空格" case, it currently validates the wrong error path and can mask regressions in the missing-space logic.

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