Adjust release titles for beta/run

This change updates the release workflow to use display-only titles that match the release mode: run shows the base version (for example 1.2.1), while beta shows BETA {base}. The real tag/version remains unchanged for updater compatibility. The release notes plan document was also updated to document this naming convention.

docs/auto-update-plan.md

@@ -308,6 +308,8 @@ src/
 - `## 更新了什么内容`：自上个 `v*` tag 以来的提交记录，每条默认折叠
   （`<details><summary>·Commit 1cf906d</summary>…</details>`）
 - 上传产物：setup.exe + latest.yml + release-notes.md（electron-updater 更新清单）
+- **Release 标题命名（仅展示名，tag/真实版本号不变）**：run → `{base}`（如 `1.2.1`），
+  beta → `BETA {base}`（如 `BETA 1.2.1`）
 
 **⚠️ 版本语义注意（electron-updater）**：
 - `{base}-{buildId}` 属 semver prerelease；**electron-updater 默认 `allowPrerelease=false` 会直接跳过带